We look at the division of 1210657 by 624 
The aim is to understand the frequency of 624 in 1210657.

On to step 1:
The number 624 fits into 1 0 times, leaving a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Append the next digit (2) from the dividend to 1 and continue with: 12 / 624

Moving on to step 2:
When dividing 12 by 624, we get 0 with a remainder of 12.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 12 and we're left with 12.
Include the next digit (1) from the dividend after 12, then repeat: 121 / 624

Going ahead to step 3:
624 goes into 121 0 times with a remainder of 121.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 121 and we're left with 121.
Grab the next digit (0) from the dividend, add it to 121, then carry on: 1210 / 624

Moving on to step 4:
If we divide 1210 by 624, we get 1 and a remainder of 586.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we subtract 624 from 1210, we get 586.
Grab the next digit (6) from the dividend, add it to 586, then carry on: 5866 / 624

Let's proceed to step 5:
624 goes into 5866 9 times with a remainder of 250.
The next digit of our result is 9. 
Result so far: 19.0
Subtract 5616 from 5866 to get 250.
Fetch the next digit (5) from the dividend, attach it to 250 and continue: 2505 / 624

On to step 6:
The number 624 fits into 2505 4 times, leaving a remainder of 9.
The number 4 becomes the next digit in our result. 
Result so far: 194.0
Subtract 2496 from 2505 to get 9.
Grab the next digit (7) from the dividend, add it to 9, then carry on: 97 / 624

Going ahead to step 7:
The number 624 fits into 97 0 times, leaving a remainder of 97.
Record the quotient 0 as the next digit in the result. 
Result so far: 1940.0
If we subtract 0 from 97, we get 97.
Since there are no more digits in the dividend, we add a zero to the remainder making it 970, and continue the process.

Advancing to step 8:
When dividing 970 by 624, we get 1 with a remainder of 346.
Put 1 as the next digit of the answer. 
Result so far: 1940.1
Subtracting 624 from 970 leaves us with 346.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3460, and continue the process.

Let's proceed to step 9:
3460 divided by 624 is 5 with a remainder of 340.
The next digit of our result is 5. 
Result so far: 1940.15
Subtracting 3120 from 3460 leaves us with 340.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3400, and continue the process.

On to step 10:
If we divide 3400 by 624, we get 5 and a remainder of 280.
Put 5 as the next digit of the answer. 
Result so far: 1940.155
Subtracting 3120 from 3400 leaves us with 280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2800, and continue the process.

After the division, we end up with 1940.155 and a remainder of 0.028.