We're dividing 598006 by 90 
The aim is to understand the frequency of 90 in 598006.

Going ahead to step 1:
When dividing 5 by 90, we get 0 with a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Bring next digit (9) of the dividend behind the 5 and repeat the process: 59 / 90

On to step 2:
When dividing 59 by 90, we get 0 with a remainder of 59.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 59 to get 59.
Take the next digit (8) from the dividend and append it to 59, then repeat: 598 / 90

Let's proceed to step 3:
If we divide 598 by 90, we get 6 and a remainder of 58.
The number 6 becomes the next digit in our result. 
Result so far: 6.0
Subtract 540 from 598 to get 58.
Take the next digit (0) from the dividend and append it to 58, then repeat: 580 / 90

Moving on to step 4:
90 can be fit into 580 6 times, resulting in a remainder of 40.
Write down 6 as next digit of the result. 
Result so far: 66.0
Subtract 540 from 580 to get 40.
Take the next digit (0) from the dividend and append it to 40, then repeat: 400 / 90

Advancing to step 5:
90 goes into 400 4 times with a remainder of 40.
The number 4 becomes the next digit in our result. 
Result so far: 664.0
Deduct 360 from 400 and we're left with 40.
Fetch the next digit (6) from the dividend, attach it to 40 and continue: 406 / 90

Moving on to step 6:
When dividing 406 by 90, we get 4 with a remainder of 46.
The number 4 becomes the next digit in our result. 
Result so far: 6644.0
Subtract 360 from 406 to get 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

On to step 7:
When dividing 460 by 90, we get 5 with a remainder of 10.
The next digit of our result is 5. 
Result so far: 6644.5
The remainder is 10 after subtracting 450 from 460.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 8:
100 divided by 90 is 1 with a remainder of 10.
The next digit of our result is 1. 
Result so far: 6644.51
Subtracting 90 from 100 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Let's proceed to step 9:
90 can be fit into 100 1 times, resulting in a remainder of 10.
Use 1 as the next digit of our solution. 
Result so far: 6644.511
Subtracting 90 from 100 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

The final result is 6644.511 with a remainder of 0.001.