582591 divided by 15 
The aim is to understand the frequency of 15 in 582591.

Advancing to step 1:
5 divided by 15 is 0 with 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.
Grab the next digit (8) from the dividend, add it to 5, then carry on: 58 / 15

Let's proceed to step 2:
15 can be fit into 58 3 times, resulting in a remainder of 13.
Write down 3 as next digit of the result. 
Result so far: 3.0
If we subtract 45 from 58, we get 13.
Append the next digit (2) from the dividend to 13 and continue with: 132 / 15

On to step 3:
15 can be fit into 132 8 times, resulting in a remainder of 12.
The number 8 becomes the next digit in our result. 
Result so far: 38.0
If we subtract 120 from 132, we get 12.
Fetch the next digit (5) from the dividend, attach it to 12 and continue: 125 / 15

Advancing to step 4:
125 divided by 15 is 8 with a remainder of 5.
Use 8 as the next digit of our solution. 
Result so far: 388.0
Subtracting 120 from 125 leaves us with 5.
Grab the next digit (9) from the dividend, add it to 5, then carry on: 59 / 15

Step 5:
15 can be fit into 59 3 times, resulting in a remainder of 14.
Record the quotient 3 as the next digit in the result. 
Result so far: 3883.0
The remainder is 14 after subtracting 45 from 59.
Grab the next digit (1) from the dividend, add it to 14, then carry on: 141 / 15

Moving on to step 6:
When dividing 141 by 15, we get 9 with a remainder of 6.
Record the quotient 9 as the next digit in the result. 
Result so far: 38839.0
The remainder is 6 after subtracting 135 from 141.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Let's proceed to step 7:
15 can be fit into 60 4 times, resulting in a remainder of 0.
The next digit of our result is 4. 
Result so far: 38839.4
If we subtract 60 from 60, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 8:
When dividing 0 by 15, we get 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 38839.4
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 9:
15 can be fit into 0 0 times, resulting in a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 38839.4
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The quotient of the division is 38839.4, and the remainder is 0.0.