6628160 ÷ 591 
The aim is to understand the frequency of 591 in 6628160.

Moving on to step 1:
The number 591 fits into 6 0 times, leaving a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Bring next digit (6) of the dividend behind the 6 and repeat the process: 66 / 591

Going ahead to step 2:
66 divided by 591 is 0 with a remainder of 66.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 66 leaves us with 66.
Fetch the next digit (2) from the dividend, attach it to 66 and continue: 662 / 591

On to step 3:
591 can be fit into 662 1 times, resulting in a remainder of 71.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtract 591 from 662 to get 71.
Bring next digit (8) of the dividend behind the 71 and repeat the process: 718 / 591

Going ahead to step 4:
591 goes into 718 1 times with a remainder of 127.
Record the quotient 1 as the next digit in the result. 
Result so far: 11.0
The remainder is 127 after subtracting 591 from 718.
Include the next digit (1) from the dividend after 127, then repeat: 1271 / 591

Moving on to step 5:
If we divide 1271 by 591, we get 2 and a remainder of 89.
Put 2 as the next digit of the answer. 
Result so far: 112.0
Subtracting 1182 from 1271 leaves us with 89.
Include the next digit (6) from the dividend after 89, then repeat: 896 / 591

Advancing to step 6:
896 divided by 591 is 1 with a remainder of 305.
Record the quotient 1 as the next digit in the result. 
Result so far: 1121.0
If we take 591 away from 896, we end up with 305.
Take the next digit (0) from the dividend and append it to 305, then repeat: 3050 / 591

Advancing to step 7:
591 goes into 3050 5 times with a remainder of 95.
Use 5 as the next digit of our solution. 
Result so far: 11215.0
If we take 2955 away from 3050, we end up with 95.
Since there are no more digits in the dividend, we add a zero to the remainder making it 950, and continue the process.

On to step 8:
950 divided by 591 is 1 with a remainder of 359.
The number 1 becomes the next digit in our result. 
Result so far: 11215.1
Deduct 591 from 950 and we're left with 359.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3590, and continue the process.

Let's proceed to step 9:
3590 divided by 591 is 6 with a remainder of 44.
Record the quotient 6 as the next digit in the result. 
Result so far: 11215.16
If we take 3546 away from 3590, we end up with 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

On to step 10:
591 can be fit into 440 0 times, resulting in a remainder of 440.
The number 0 becomes the next digit in our result. 
Result so far: 11215.16
If we subtract 0 from 440, we get 440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4400, and continue the process.

On to step 11:
The number 591 fits into 4400 7 times, leaving a remainder of 263.
Write down 7 as next digit of the result. 
Result so far: 11215.1607
If we subtract 4137 from 4400, we get 263.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2630, and continue the process.

Advancing to step 12:
The number 591 fits into 2630 4 times, leaving a remainder of 266.
The number 4 becomes the next digit in our result. 
Result so far: 11215.16074
Subtracting 2364 from 2630 leaves us with 266.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2660, and continue the process.

Advancing to step 13:
The number 591 fits into 2660 4 times, leaving a remainder of 296.
The next digit of our result is 4. 
Result so far: 11215.160744
If we subtract 2364 from 2660, we get 296.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2960, and continue the process.

The final result is 11215.160744 with a remainder of 2.96e-05.