We're dividing 638674 by 4 
We want to figure out the number of times 638674 can be divided by 4.

Moving on to step 1:
When dividing 6 by 4, we get 1 with a remainder of 2.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtracting 4 from 6 leaves us with 2.
Append the next digit (3) from the dividend to 2 and continue with: 23 / 4

On to step 2:
23 divided by 4 is 5 with a remainder of 3.
The number 5 becomes the next digit in our result. 
Result so far: 15.0
If we subtract 20 from 23, we get 3.
Take the next digit (8) from the dividend and append it to 3, then repeat: 38 / 4

Moving on to step 3:
38 divided by 4 is 9 with a remainder of 2.
The number 9 becomes the next digit in our result. 
Result so far: 159.0
If we take 36 away from 38, we end up with 2.
Include the next digit (6) from the dividend after 2, then repeat: 26 / 4

Moving on to step 4:
4 can be fit into 26 6 times, resulting in a remainder of 2.
The next digit of our result is 6. 
Result so far: 1596.0
Subtracting 24 from 26 leaves us with 2.
Include the next digit (7) from the dividend after 2, then repeat: 27 / 4

Step 5:
4 goes into 27 6 times with a remainder of 3.
Write down 6 as next digit of the result. 
Result so far: 15966.0
Deduct 24 from 27 and we're left with 3.
Take the next digit (4) from the dividend and append it to 3, then repeat: 34 / 4

Moving on to step 6:
4 can be fit into 34 8 times, resulting in a remainder of 2.
Write down 8 as next digit of the result. 
Result so far: 159668.0
Subtract 32 from 34 to 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.

Going ahead to step 7:
4 can be fit into 20 5 times, resulting in a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 159668.5
Deduct 20 from 20 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.

Going ahead to step 8:
If we divide 0 by 4, we get 0 and a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 159668.5
Subtract 0 from 0 to 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:
4 goes into 0 0 times with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 159668.5
Subtract 0 from 0 to 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.

The final outcome is 159668.5, with a leftover of 0.0.