We're dividing 591399 by 59 
The aim is to understand the frequency of 59 in 591399.

Step 1:
The number 59 fits into 5 0 times, leaving a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 5, we get 5.
Append the next digit (9) from the dividend to 5 and continue with: 59 / 59

Let's proceed to step 2:
If we divide 59 by 59, we get 1 and a remainder of 0.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtract 59 from 59 to get 0.
Fetch the next digit (1) from the dividend, attach it to 0 and continue: 1 / 59

Going ahead to step 3:
If we divide 1 by 59, we get 0 and a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 10.0
Deduct 0 from 1 and we're left with 1.
Include the next digit (3) from the dividend after 1, then repeat: 13 / 59

Moving on to step 4:
59 goes into 13 0 times with a remainder of 13.
Record the quotient 0 as the next digit in the result. 
Result so far: 100.0
If we take 0 away from 13, we end up with 13.
Take the next digit (9) from the dividend and append it to 13, then repeat: 139 / 59

On to step 5:
When dividing 139 by 59, we get 2 with a remainder of 21.
Use 2 as the next digit of our solution. 
Result so far: 1002.0
Subtracting 118 from 139 leaves us with 21.
Fetch the next digit (9) from the dividend, attach it to 21 and continue: 219 / 59

On to step 6:
59 goes into 219 3 times with a remainder of 42.
The number 3 becomes the next digit in our result. 
Result so far: 10023.0
If we subtract 177 from 219, we get 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Advancing to step 7:
420 divided by 59 is 7 with a remainder of 7.
The next digit of our result is 7. 
Result so far: 10023.7
Subtract 413 from 420 to get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Going ahead to step 8:
59 goes into 70 1 times with a remainder of 11.
Use 1 as the next digit of our solution. 
Result so far: 10023.71
The remainder is 11 after subtracting 59 from 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

On to step 9:
110 divided by 59 is 1 with a remainder of 51.
The next digit of our result is 1. 
Result so far: 10023.711
Deduct 59 from 110 and we're left with 51.
Since there are no more digits in the dividend, we add a zero to the remainder making it 510, and continue the process.

The quotient of the division is 10023.711, and the remainder is 0.0051.