We look at the division of 81592607 by 998 
The aim is to understand the frequency of 998 in 81592607.

Advancing to step 1:
8 divided by 998 is 0 with a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Bring next digit (1) of the dividend behind the 8 and repeat the process: 81 / 998

Let's proceed to step 2:
When dividing 81 by 998, we get 0 with a remainder of 81.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 81 after subtracting 0 from 81.
Take the next digit (5) from the dividend and append it to 81, then repeat: 815 / 998

Let's proceed to step 3:
When dividing 815 by 998, we get 0 with a remainder of 815.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 815, we get 815.
Fetch the next digit (9) from the dividend, attach it to 815 and continue: 8159 / 998

On to step 4:
8159 divided by 998 is 8 with a remainder of 175.
Write down 8 as next digit of the result. 
Result so far: 8.0
If we subtract 7984 from 8159, we get 175.
Take the next digit (2) from the dividend and append it to 175, then repeat: 1752 / 998

Moving on to step 5:
1752 divided by 998 is 1 with a remainder of 754.
The next digit of our result is 1. 
Result so far: 81.0
The remainder is 754 after subtracting 998 from 1752.
Bring next digit (6) of the dividend behind the 754 and repeat the process: 7546 / 998

Going ahead to step 6:
When dividing 7546 by 998, we get 7 with a remainder of 560.
Put 7 as the next digit of the answer. 
Result so far: 817.0
If we subtract 6986 from 7546, we get 560.
Fetch the next digit (0) from the dividend, attach it to 560 and continue: 5600 / 998

Let's proceed to step 7:
998 goes into 5600 5 times with a remainder of 610.
The next digit of our result is 5. 
Result so far: 8175.0
The remainder is 610 after subtracting 4990 from 5600.
Append the next digit (7) from the dividend to 610 and continue with: 6107 / 998

Moving on to step 8:
When dividing 6107 by 998, we get 6 with a remainder of 119.
Record the quotient 6 as the next digit in the result. 
Result so far: 81756.0
If we subtract 5988 from 6107, we get 119.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1190, and continue the process.

On to step 9:
1190 divided by 998 is 1 with a remainder of 192.
The number 1 becomes the next digit in our result. 
Result so far: 81756.1
The remainder is 192 after subtracting 998 from 1190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1920, and continue the process.

Let's proceed to step 10:
1920 divided by 998 is 1 with a remainder of 922.
Record the quotient 1 as the next digit in the result. 
Result so far: 81756.11
Subtracting 998 from 1920 leaves us with 922.
Since there are no more digits in the dividend, we add a zero to the remainder making it 9220, and continue the process.

The final result is 81756.11 with a remainder of 0.922.