We're dividing 645898 by 4 
We want to divide 645898 by 4.

Let's proceed to step 1:
If we divide 6 by 4, we get 1 and a remainder of 2.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
The remainder is 2 after subtracting 4 from 6.
Bring next digit (4) of the dividend behind the 2 and repeat the process: 24 / 4

Advancing to step 2:
When dividing 24 by 4, we get 6 with a remainder of 0.
The number 6 becomes the next digit in our result. 
Result so far: 16.0
Deduct 24 from 24 and we're left with 0.
Fetch the next digit (5) from the dividend, attach it to 0 and continue: 5 / 4

Moving on to step 3:
4 goes into 5 1 times with a remainder of 1.
The next digit of our result is 1. 
Result so far: 161.0
Subtract 4 from 5 to get 1.
Include the next digit (8) from the dividend after 1, then repeat: 18 / 4

Moving on to step 4:
4 goes into 18 4 times with a remainder of 2.
Put 4 as the next digit of the answer. 
Result so far: 1614.0
If we take 16 away from 18, we end up with 2.
Append the next digit (9) from the dividend to 2 and continue with: 29 / 4

Going ahead to step 5:
If we divide 29 by 4, we get 7 and a remainder of 1.
Record the quotient 7 as the next digit in the result. 
Result so far: 16147.0
If we subtract 28 from 29, we get 1.
Take the next digit (8) from the dividend and append it to 1, then repeat: 18 / 4

Step 6:
4 goes into 18 4 times with a remainder of 2.
Put 4 as the next digit of the answer. 
Result so far: 161474.0
If we subtract 16 from 18, we get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

On to step 7:
4 can be fit into 20 5 times, resulting in a remainder of 0.
The next digit of our result is 5. 
Result so far: 161474.5
The remainder is 0 after subtracting 20 from 20.
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 8:
4 can be fit into 0 0 times, resulting in a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 161474.5
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 9:
If we divide 0 by 4, we get 0 and a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 161474.5
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.

The final result is 161474.5 with a remainder of 0.0.