We're dividing 6550181 by 621 
The aim is to understand the frequency of 621 in 6550181.

Advancing to step 1:
When dividing 6 by 621, we get 0 with a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Take the next digit (5) from the dividend and append it to 6, then repeat: 65 / 621

Step 2:
The number 621 fits into 65 0 times, leaving a remainder of 65.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 65, we end up with 65.
Grab the next digit (5) from the dividend, add it to 65, then carry on: 655 / 621

Advancing to step 3:
621 goes into 655 1 times with a remainder of 34.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we subtract 621 from 655, we get 34.
Bring next digit (0) of the dividend behind the 34 and repeat the process: 340 / 621

Advancing to step 4:
When dividing 340 by 621, we get 0 with a remainder of 340.
The next digit of our result is 0. 
Result so far: 10.0
If we subtract 0 from 340, we get 340.
Grab the next digit (1) from the dividend, add it to 340, then carry on: 3401 / 621

On to step 5:
621 goes into 3401 5 times with a remainder of 296.
Use 5 as the next digit of our solution. 
Result so far: 105.0
If we subtract 3105 from 3401, we get 296.
Append the next digit (8) from the dividend to 296 and continue with: 2968 / 621

Step 6:
2968 divided by 621 is 4 with a remainder of 484.
The number 4 becomes the next digit in our result. 
Result so far: 1054.0
If we subtract 2484 from 2968, we get 484.
Bring next digit (1) of the dividend behind the 484 and repeat the process: 4841 / 621

Moving on to step 7:
4841 divided by 621 is 7 with a remainder of 494.
Record the quotient 7 as the next digit in the result. 
Result so far: 10547.0
Subtracting 4347 from 4841 leaves us with 494.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4940, and continue the process.

Let's proceed to step 8:
621 can be fit into 4940 7 times, resulting in a remainder of 593.
The number 7 becomes the next digit in our result. 
Result so far: 10547.7
Subtract 4347 from 4940 to get 593.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5930, and continue the process.

Step 9:
When dividing 5930 by 621, we get 9 with a remainder of 341.
Put 9 as the next digit of the answer. 
Result so far: 10547.79
If we take 5589 away from 5930, we end up with 341.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3410, and continue the process.

Moving on to step 10:
When dividing 3410 by 621, we get 5 with a remainder of 305.
The next digit of our result is 5. 
Result so far: 10547.795
If we take 3105 away from 3410, we end up with 305.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3050, and continue the process.

On to step 11:
The number 621 fits into 3050 4 times, leaving a remainder of 566.
Write down 4 as next digit of the result. 
Result so far: 10547.7954
The remainder is 566 after subtracting 2484 from 3050.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5660, and continue the process.

Step 12:
621 can be fit into 5660 9 times, resulting in a remainder of 71.
The number 9 becomes the next digit in our result. 
Result so far: 10547.79549
Deduct 5589 from 5660 and we're left with 71.
Since there are no more digits in the dividend, we add a zero to the remainder making it 710, and continue the process.

Advancing to step 13:
710 divided by 621 is 1 with a remainder of 89.
Put 1 as the next digit of the answer. 
Result so far: 10547.795491
Subtracting 621 from 710 leaves us with 89.
Since there are no more digits in the dividend, we add a zero to the remainder making it 890, and continue the process.

Step 14:
621 goes into 890 1 times with a remainder of 269.
Put 1 as the next digit of the answer. 
Result so far: 10547.7954911
Deduct 621 from 890 and we're left with 269.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2690, and continue the process.

In conclusion, the division gives 10547.7954911 with a balance of 2.69e-06.