620644 divided by 25 
We're looking to find how many times 25 goes into 620644.

On to step 1:
6 divided by 25 is 0 with a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Append the next digit (2) from the dividend to 6 and continue with: 62 / 25

Moving on to step 2:
62 divided by 25 is 2 with a remainder of 12.
Use 2 as the next digit of our solution. 
Result so far: 2.0
Subtract 50 from 62 to get 12.
Bring next digit (0) of the dividend behind the 12 and repeat the process: 120 / 25

Advancing to step 3:
When dividing 120 by 25, we get 4 with a remainder of 20.
Record the quotient 4 as the next digit in the result. 
Result so far: 24.0
If we take 100 away from 120, we end up with 20.
Bring next digit (6) of the dividend behind the 20 and repeat the process: 206 / 25

Moving on to step 4:
If we divide 206 by 25, we get 8 and a remainder of 6.
The next digit of our result is 8. 
Result so far: 248.0
Subtract 200 from 206 to get 6.
Include the next digit (4) from the dividend after 6, then repeat: 64 / 25

Let's proceed to step 5:
64 divided by 25 is 2 with a remainder of 14.
Put 2 as the next digit of the answer. 
Result so far: 2482.0
If we subtract 50 from 64, we get 14.
Grab the next digit (4) from the dividend, add it to 14, then carry on: 144 / 25

Let's proceed to step 6:
25 goes into 144 5 times with a remainder of 19.
The next digit of our result is 5. 
Result so far: 24825.0
Subtracting 125 from 144 leaves us with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Going ahead to step 7:
The number 25 fits into 190 7 times, leaving a remainder of 15.
Use 7 as the next digit of our solution. 
Result so far: 24825.7
Subtract 175 from 190 to get 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.
The number 6 becomes the next digit in our result. 
Result so far: 24825.76
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.

On to step 9:
The number 25 fits into 0 0 times, leaving a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 24825.76
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.

Advancing to step 10:
If we divide 0 by 25, we get 0 and a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 24825.76
If we take 0 away from 0, we end up 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.

The final result is 24825.76 with a remainder of 0.0.