Let's divide 9124864 by 621
The aim is to understand the frequency of 621 in 9124864.

Step 1:
9 divided by 621 is 0 with a remainder of 9.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 9 leaves us with 9.
Grab the next digit (1) from the dividend, add it to 9, then carry on: 91 / 621

Let's proceed to step 2:
If we divide 91 by 621, we get 0 and a remainder of 91.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 91 and we're left with 91.
Append the next digit (2) from the dividend to 91 and continue with: 912 / 621

Let's proceed to step 3:
If we divide 912 by 621, we get 1 and a remainder of 291.
The next digit of our result is 1. 
Result so far: 1.0
Deduct 621 from 912 and we're left with 291.
Append the next digit (4) from the dividend to 291 and continue with: 2914 / 621

Going ahead to step 4:
When dividing 2914 by 621, we get 4 with a remainder of 430.
Put 4 as the next digit of the answer. 
Result so far: 14.0
If we subtract 2484 from 2914, we get 430.
Take the next digit (8) from the dividend and append it to 430, then repeat: 4308 / 621

Step 5:
The number 621 fits into 4308 6 times, leaving a remainder of 582.
The next digit of our result is 6. 
Result so far: 146.0
If we subtract 3726 from 4308, we get 582.
Fetch the next digit (6) from the dividend, attach it to 582 and continue: 5826 / 621

Step 6:
When dividing 5826 by 621, we get 9 with a remainder of 237.
Write down 9 as next digit of the result. 
Result so far: 1469.0
Subtracting 5589 from 5826 leaves us with 237.
Append the next digit (4) from the dividend to 237 and continue with: 2374 / 621

Going ahead to step 7:
621 can be fit into 2374 3 times, resulting in a remainder of 511.
The next digit of our result is 3. 
Result so far: 14693.0
If we take 1863 away from 2374, we end up with 511.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5110, and continue the process.

Step 8:
The number 621 fits into 5110 8 times, leaving a remainder of 142.
Put 8 as the next digit of the answer. 
Result so far: 14693.8
Deduct 4968 from 5110 and we're left with 142.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1420, and continue the process.

Advancing to step 9:
When dividing 1420 by 621, we get 2 with a remainder of 178.
Use 2 as the next digit of our solution. 
Result so far: 14693.82
Subtract 1242 from 1420 to get 178.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1780, and continue the process.

On to step 10:
If we divide 1780 by 621, we get 2 and a remainder of 538.
Record the quotient 2 as the next digit in the result. 
Result so far: 14693.822
Subtract 1242 from 1780 to get 538.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5380, and continue the process.

The quotient of the division is 14693.822, and the remainder is 0.0538.