We're dividing 8186199 by 621 
The aim is to understand the frequency of 621 in 8186199.

Moving on to step 1:
The number 621 fits into 8 0 times, leaving a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Append the next digit (1) from the dividend to 8 and continue with: 81 / 621

Advancing to step 2:
The number 621 fits into 81 0 times, leaving a remainder of 81.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 81, we end up with 81.
Grab the next digit (8) from the dividend, add it to 81, then carry on: 818 / 621

Step 3:
If we divide 818 by 621, we get 1 and a remainder of 197.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
The remainder is 197 after subtracting 621 from 818.
Fetch the next digit (6) from the dividend, attach it to 197 and continue: 1976 / 621

Moving on to step 4:
621 goes into 1976 3 times with a remainder of 113.
The number 3 becomes the next digit in our result. 
Result so far: 13.0
If we subtract 1863 from 1976, we get 113.
Include the next digit (1) from the dividend after 113, then repeat: 1131 / 621

Moving on to step 5:
When dividing 1131 by 621, we get 1 with a remainder of 510.
The next digit of our result is 1. 
Result so far: 131.0
Subtract 621 from 1131 to get 510.
Fetch the next digit (9) from the dividend, attach it to 510 and continue: 5109 / 621

Moving on to step 6:
621 can be fit into 5109 8 times, resulting in a remainder of 141.
Record the quotient 8 as the next digit in the result. 
Result so far: 1318.0
Subtracting 4968 from 5109 leaves us with 141.
Append the next digit (9) from the dividend to 141 and continue with: 1419 / 621

Going ahead to step 7:
When dividing 1419 by 621, we get 2 with a remainder of 177.
Write down 2 as next digit of the result. 
Result so far: 13182.0
Deduct 1242 from 1419 and we're left with 177.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1770, and continue the process.

Going ahead to step 8:
621 goes into 1770 2 times with a remainder of 528.
The number 2 becomes the next digit in our result. 
Result so far: 13182.2
Subtract 1242 from 1770 to get 528.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5280, and continue the process.

On to step 9:
621 goes into 5280 8 times with a remainder of 312.
Put 8 as the next digit of the answer. 
Result so far: 13182.28
The remainder is 312 after subtracting 4968 from 5280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3120, and continue the process.

Going ahead to step 10:
621 goes into 3120 5 times with a remainder of 15.
Record the quotient 5 as the next digit in the result. 
Result so far: 13182.285
Deduct 3105 from 3120 and we're left with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

On to step 11:
The number 621 fits into 150 0 times, leaving a remainder of 150.
Put 0 as the next digit of the answer. 
Result so far: 13182.285
Deduct 0 from 150 and we're left with 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1500, and continue the process.

On to step 12:
When dividing 1500 by 621, we get 2 with a remainder of 258.
Record the quotient 2 as the next digit in the result. 
Result so far: 13182.28502
The remainder is 258 after subtracting 1242 from 1500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2580, and continue the process.

On to step 13:
621 goes into 2580 4 times with a remainder of 96.
Write down 4 as next digit of the result. 
Result so far: 13182.285024
Deduct 2484 from 2580 and we're left with 96.
Since there are no more digits in the dividend, we add a zero to the remainder making it 960, and continue the process.

On to step 14:
If we divide 960 by 621, we get 1 and a remainder of 339.
The next digit of our result is 1. 
Result so far: 13182.2850241
Subtract 621 from 960 to get 339.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3390, and continue the process.

On to step 15:
The number 621 fits into 3390 5 times, leaving a remainder of 285.
The next digit of our result is 5. 
Result so far: 13182.28502415
Subtract 3105 from 3390 to get 285.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2850, and continue the process.

The final outcome is 13182.28502415, with a leftover of 2.85e-07.