We look at the division of 605639 by 25 
The aim is to understand the frequency of 25 in 605639.

Let's proceed to step 1:
6 divided by 25 is 0 with a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Take the next digit (0) from the dividend and append it to 6, then repeat: 60 / 25

Let's proceed to step 2:
25 can be fit into 60 2 times, resulting in a remainder of 10.
Use 2 as the next digit of our solution. 
Result so far: 2.0
The remainder is 10 after subtracting 50 from 60.
Fetch the next digit (5) from the dividend, attach it to 10 and continue: 105 / 25

Let's proceed to step 3:
25 goes into 105 4 times with a remainder of 5.
The next digit of our result is 4. 
Result so far: 24.0
If we take 100 away from 105, we end up with 5.
Grab the next digit (6) from the dividend, add it to 5, then carry on: 56 / 25

Advancing to step 4:
25 goes into 56 2 times with a remainder of 6.
Record the quotient 2 as the next digit in the result. 
Result so far: 242.0
If we subtract 50 from 56, we get 6.
Append the next digit (3) from the dividend to 6 and continue with: 63 / 25

Going ahead to step 5:
25 can be fit into 63 2 times, resulting in a remainder of 13.
Put 2 as the next digit of the answer. 
Result so far: 2422.0
Subtracting 50 from 63 leaves us with 13.
Bring next digit (9) of the dividend behind the 13 and repeat the process: 139 / 25

Let's proceed to step 6:
139 divided by 25 is 5 with a remainder of 14.
Put 5 as the next digit of the answer. 
Result so far: 24225.0
If we take 125 away from 139, we end up with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Going ahead to step 7:
When dividing 140 by 25, we get 5 with a remainder of 15.
The number 5 becomes the next digit in our result. 
Result so far: 24225.5
If we take 125 away from 140, we end up with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Let's proceed to step 8:
25 goes into 150 6 times with a remainder of 0.
Write down 6 as next digit of the result. 
Result so far: 24225.56
Subtracting 150 from 150 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 9:
When dividing 0 by 25, we get 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 24225.56
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 10:
25 goes into 0 0 times with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 24225.56
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Our division results in 24225.56 with a remaining 0.0.