We look at the division of 75408525 by 598 
The aim is to understand the frequency of 598 in 75408525.

Advancing to step 1:
When dividing 7 by 598, we get 0 with a remainder of 7.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 7 to get 7.
Include the next digit (5) from the dividend after 7, then repeat: 75 / 598

Going ahead to step 2:
When dividing 75 by 598, we get 0 with a remainder of 75.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 75 leaves us with 75.
Grab the next digit (4) from the dividend, add it to 75, then carry on: 754 / 598

Going ahead to step 3:
598 goes into 754 1 times with a remainder of 156.
The next digit of our result is 1. 
Result so far: 1.0
If we subtract 598 from 754, we get 156.
Include the next digit (0) from the dividend after 156, then repeat: 1560 / 598

Going ahead to step 4:
When dividing 1560 by 598, we get 2 with a remainder of 364.
Put 2 as the next digit of the answer. 
Result so far: 12.0
If we subtract 1196 from 1560, we get 364.
Take the next digit (8) from the dividend and append it to 364, then repeat: 3648 / 598

Going ahead to step 5:
598 goes into 3648 6 times with a remainder of 60.
The next digit of our result is 6. 
Result so far: 126.0
Deduct 3588 from 3648 and we're left with 60.
Append the next digit (5) from the dividend to 60 and continue with: 605 / 598

Let's proceed to step 6:
605 divided by 598 is 1 with a remainder of 7.
Record the quotient 1 as the next digit in the result. 
Result so far: 1261.0
The remainder is 7 after subtracting 598 from 605.
Fetch the next digit (2) from the dividend, attach it to 7 and continue: 72 / 598

Let's proceed to step 7:
598 goes into 72 0 times with a remainder of 72.
The next digit of our result is 0. 
Result so far: 12610.0
Deduct 0 from 72 and we're left with 72.
Grab the next digit (5) from the dividend, add it to 72, then carry on: 725 / 598

Moving on to step 8:
725 divided by 598 is 1 with a remainder of 127.
The number 1 becomes the next digit in our result. 
Result so far: 126101.0
Subtracting 598 from 725 leaves us with 127.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1270, and continue the process.

Moving on to step 9:
When dividing 1270 by 598, we get 2 with a remainder of 74.
Use 2 as the next digit of our solution. 
Result so far: 126101.2
Subtracting 1196 from 1270 leaves us with 74.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

Going ahead to step 10:
598 can be fit into 740 1 times, resulting in a remainder of 142.
Put 1 as the next digit of the answer. 
Result so far: 126101.21
Subtracting 598 from 740 leaves us with 142.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1420, and continue the process.

Going ahead to step 11:
When dividing 1420 by 598, we get 2 with a remainder of 224.
The number 2 becomes the next digit in our result. 
Result so far: 126101.212
If we take 1196 away from 1420, we end up with 224.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2240, and continue the process.

Let's proceed to step 12:
598 can be fit into 2240 3 times, resulting in a remainder of 446.
Write down 3 as next digit of the result. 
Result so far: 126101.2123
If we subtract 1794 from 2240, we get 446.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4460, and continue the process.

On to step 13:
The number 598 fits into 4460 7 times, leaving a remainder of 274.
The number 7 becomes the next digit in our result. 
Result so far: 126101.21237
Deduct 4186 from 4460 and we're left with 274.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2740, and continue the process.

Let's proceed to step 14:
2740 divided by 598 is 4 with a remainder of 348.
The next digit of our result is 4. 
Result so far: 126101.212374
The remainder is 348 after subtracting 2392 from 2740.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3480, and continue the process.

Let's proceed to step 15:
598 goes into 3480 5 times with a remainder of 490.
The number 5 becomes the next digit in our result. 
Result so far: 126101.2123745
The remainder is 490 after subtracting 2990 from 3480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4900, and continue the process.

On to step 16:
If we divide 4900 by 598, we get 8 and a remainder of 116.
Record the quotient 8 as the next digit in the result. 
Result so far: 126101.21237458
Deduct 4784 from 4900 and we're left with 116.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1160, and continue the process.

The final result is 126101.21237458 with a remainder of 1.16e-07.