We look at the division of 10621812 by 566 
The aim is to understand the frequency of 566 in 10621812.

Step 1:
The number 566 fits into 1 0 times, leaving a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Include the next digit (0) from the dividend after 1, then repeat: 10 / 566

On to step 2:
The number 566 fits into 10 0 times, leaving a remainder of 10.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 10 to get 10.
Append the next digit (6) from the dividend to 10 and continue with: 106 / 566

On to step 3:
When dividing 106 by 566, we get 0 with a remainder of 106.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 106 to get 106.
Bring next digit (2) of the dividend behind the 106 and repeat the process: 1062 / 566

Going ahead to step 4:
If we divide 1062 by 566, we get 1 and a remainder of 496.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Deduct 566 from 1062 and we're left with 496.
Append the next digit (1) from the dividend to 496 and continue with: 4961 / 566

Let's proceed to step 5:
The number 566 fits into 4961 8 times, leaving a remainder of 433.
Record the quotient 8 as the next digit in the result. 
Result so far: 18.0
If we subtract 4528 from 4961, we get 433.
Bring next digit (8) of the dividend behind the 433 and repeat the process: 4338 / 566

On to step 6:
566 can be fit into 4338 7 times, resulting in a remainder of 376.
The number 7 becomes the next digit in our result. 
Result so far: 187.0
If we subtract 3962 from 4338, we get 376.
Include the next digit (1) from the dividend after 376, then repeat: 3761 / 566

Advancing to step 7:
The number 566 fits into 3761 6 times, leaving a remainder of 365.
Put 6 as the next digit of the answer. 
Result so far: 1876.0
Subtract 3396 from 3761 to get 365.
Bring next digit (2) of the dividend behind the 365 and repeat the process: 3652 / 566

Moving on to step 8:
The number 566 fits into 3652 6 times, leaving a remainder of 256.
Write down 6 as next digit of the result. 
Result so far: 18766.0
Deduct 3396 from 3652 and we're left with 256.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2560, and continue the process.

On to step 9:
If we divide 2560 by 566, we get 4 and a remainder of 296.
Use 4 as the next digit of our solution. 
Result so far: 18766.4
If we take 2264 away from 2560, we end up with 296.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2960, and continue the process.

Let's proceed to step 10:
2960 divided by 566 is 5 with a remainder of 130.
Record the quotient 5 as the next digit in the result. 
Result so far: 18766.45
Deduct 2830 from 2960 and we're left with 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1300, and continue the process.

Moving on to step 11:
566 can be fit into 1300 2 times, resulting in a remainder of 168.
Put 2 as the next digit of the answer. 
Result so far: 18766.452
Subtract 1132 from 1300 to get 168.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1680, and continue the process.

Let's proceed to step 12:
1680 divided by 566 is 2 with a remainder of 548.
Put 2 as the next digit of the answer. 
Result so far: 18766.4522
Subtracting 1132 from 1680 leaves us with 548.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5480, and continue the process.

After the division, we end up with 18766.4522 and a remainder of 0.00548.