We're dividing 31598571 by 621 
The aim is to understand the frequency of 621 in 31598571.

Moving on to step 1:
The number 621 fits into 3 0 times, leaving a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Take the next digit (1) from the dividend and append it to 3, then repeat: 31 / 621

On to step 2:
When dividing 31 by 621, we get 0 with a remainder of 31.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 31 after subtracting 0 from 31.
Take the next digit (5) from the dividend and append it to 31, then repeat: 315 / 621

Let's proceed to step 3:
621 goes into 315 0 times with a remainder of 315.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 315, we end up with 315.
Fetch the next digit (9) from the dividend, attach it to 315 and continue: 3159 / 621

Let's proceed to step 4:
621 can be fit into 3159 5 times, resulting in a remainder of 54.
Put 5 as the next digit of the answer. 
Result so far: 5.0
Deduct 3105 from 3159 and we're left with 54.
Fetch the next digit (8) from the dividend, attach it to 54 and continue: 548 / 621

Going ahead to step 5:
When dividing 548 by 621, we get 0 with a remainder of 548.
Record the quotient 0 as the next digit in the result. 
Result so far: 50.0
Subtract 0 from 548 to get 548.
Include the next digit (5) from the dividend after 548, then repeat: 5485 / 621

Going ahead to step 6:
621 goes into 5485 8 times with a remainder of 517.
The number 8 becomes the next digit in our result. 
Result so far: 508.0
Subtracting 4968 from 5485 leaves us with 517.
Take the next digit (7) from the dividend and append it to 517, then repeat: 5177 / 621

Advancing to step 7:
621 can be fit into 5177 8 times, resulting in a remainder of 209.
Write down 8 as next digit of the result. 
Result so far: 5088.0
Deduct 4968 from 5177 and we're left with 209.
Include the next digit (1) from the dividend after 209, then repeat: 2091 / 621

On to step 8:
If we divide 2091 by 621, we get 3 and a remainder of 228.
The number 3 becomes the next digit in our result. 
Result so far: 50883.0
Subtracting 1863 from 2091 leaves us with 228.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2280, and continue the process.

Step 9:
If we divide 2280 by 621, we get 3 and a remainder of 417.
Use 3 as the next digit of our solution. 
Result so far: 50883.3
If we take 1863 away from 2280, we end up with 417.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4170, and continue the process.

Moving on to step 10:
When dividing 4170 by 621, we get 6 with a remainder of 444.
Put 6 as the next digit of the answer. 
Result so far: 50883.36
If we subtract 3726 from 4170, we get 444.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4440, and continue the process.

Moving on to step 11:
If we divide 4440 by 621, we get 7 and a remainder of 93.
Record the quotient 7 as the next digit in the result. 
Result so far: 50883.367
Subtracting 4347 from 4440 leaves us with 93.
Since there are no more digits in the dividend, we add a zero to the remainder making it 930, and continue the process.

On to step 12:
621 can be fit into 930 1 times, resulting in a remainder of 309.
The number 1 becomes the next digit in our result. 
Result so far: 50883.3671
If we subtract 621 from 930, we get 309.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3090, and continue the process.

On to step 13:
3090 divided by 621 is 4 with a remainder of 606.
Use 4 as the next digit of our solution. 
Result so far: 50883.36714
If we take 2484 away from 3090, we end up with 606.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6060, and continue the process.

Going ahead to step 14:
621 goes into 6060 9 times with a remainder of 471.
Use 9 as the next digit of our solution. 
Result so far: 50883.367149
If we subtract 5589 from 6060, we get 471.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4710, and continue the process.

Let's proceed to step 15:
If we divide 4710 by 621, we get 7 and a remainder of 363.
Use 7 as the next digit of our solution. 
Result so far: 50883.3671497
Subtract 4347 from 4710 to get 363.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3630, and continue the process.

Moving on to step 16:
The number 621 fits into 3630 5 times, leaving a remainder of 525.
The next digit of our result is 5. 
Result so far: 50883.36714975
Deduct 3105 from 3630 and we're left with 525.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5250, and continue the process.

In conclusion, the division gives 50883.36714975 with a balance of 5.25e-07.