591618 divided by 91 
The aim is to understand the frequency of 91 in 591618.

Advancing to step 1:
91 can be fit into 5 0 times, resulting in a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Bring next digit (9) of the dividend behind the 5 and repeat the process: 59 / 91

Moving on to step 2:
59 divided by 91 is 0 with a remainder of 59.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 59 to get 59.
Bring next digit (1) of the dividend behind the 59 and repeat the process: 591 / 91

Step 3:
91 goes into 591 6 times with a remainder of 45.
The number 6 becomes the next digit in our result. 
Result so far: 6.0
Deduct 546 from 591 and we're left with 45.
Take the next digit (6) from the dividend and append it to 45, then repeat: 456 / 91

Let's proceed to step 4:
The number 91 fits into 456 5 times, leaving a remainder of 1.
The next digit of our result is 5. 
Result so far: 65.0
If we take 455 away from 456, we end up with 1.
Append the next digit (1) from the dividend to 1 and continue with: 11 / 91

Advancing to step 5:
The number 91 fits into 11 0 times, leaving a remainder of 11.
Write down 0 as next digit of the result. 
Result so far: 650.0
If we take 0 away from 11, we end up with 11.
Take the next digit (8) from the dividend and append it to 11, then repeat: 118 / 91

Step 6:
The number 91 fits into 118 1 times, leaving a remainder of 27.
Record the quotient 1 as the next digit in the result. 
Result so far: 6501.0
Subtracting 91 from 118 leaves us with 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

Moving on to step 7:
91 can be fit into 270 2 times, resulting in a remainder of 88.
Put 2 as the next digit of the answer. 
Result so far: 6501.2
Deduct 182 from 270 and we're left with 88.
Since there are no more digits in the dividend, we add a zero to the remainder making it 880, and continue the process.

Step 8:
The number 91 fits into 880 9 times, leaving a remainder of 61.
Record the quotient 9 as the next digit in the result. 
Result so far: 6501.29
If we take 819 away from 880, we end up with 61.
Since there are no more digits in the dividend, we add a zero to the remainder making it 610, and continue the process.

On to step 9:
91 can be fit into 610 6 times, resulting in a remainder of 64.
Use 6 as the next digit of our solution. 
Result so far: 6501.296
Subtract 546 from 610 to get 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Moving on to step 10:
When dividing 640 by 91, we get 7 with a remainder of 3.
Record the quotient 7 as the next digit in the result. 
Result so far: 6501.2967
If we subtract 637 from 640, we get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Advancing to step 11:
If we divide 30 by 91, we get 0 and a remainder of 30.
Write down 0 as next digit of the result. 
Result so far: 6501.2967
Subtracting 0 from 30 leaves us with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Advancing to step 12:
If we divide 300 by 91, we get 3 and a remainder of 27.
Write down 3 as next digit of the result. 
Result so far: 6501.296703
Subtracting 273 from 300 leaves us with 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

Step 13:
91 can be fit into 270 2 times, resulting in a remainder of 88.
Use 2 as the next digit of our solution. 
Result so far: 6501.2967032
The remainder is 88 after subtracting 182 from 270.
Since there are no more digits in the dividend, we add a zero to the remainder making it 880, and continue the process.

Going ahead to step 14:
If we divide 880 by 91, we get 9 and a remainder of 61.
Write down 9 as next digit of the result. 
Result so far: 6501.29670329
Subtract 819 from 880 to get 61.
Since there are no more digits in the dividend, we add a zero to the remainder making it 610, and continue the process.

The quotient of the division is 6501.29670329, and the remainder is 6.1e-08.