15602721 ÷ 398 
Let's see how many times 398 fits into 15602721.

On to step 1:
When dividing 1 by 398, we get 0 with a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Take the next digit (5) from the dividend and append it to 1, then repeat: 15 / 398

Going ahead to step 2:
398 can be fit into 15 0 times, resulting in a remainder of 15.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 15 and we're left with 15.
Fetch the next digit (6) from the dividend, attach it to 15 and continue: 156 / 398

Moving on to step 3:
156 divided by 398 is 0 with a remainder of 156.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 156 leaves us with 156.
Fetch the next digit (0) from the dividend, attach it to 156 and continue: 1560 / 398

Moving on to step 4:
The number 398 fits into 1560 3 times, leaving a remainder of 366.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
Deduct 1194 from 1560 and we're left with 366.
Bring next digit (2) of the dividend behind the 366 and repeat the process: 3662 / 398

Advancing to step 5:
3662 divided by 398 is 9 with a remainder of 80.
The number 9 becomes the next digit in our result. 
Result so far: 39.0
If we subtract 3582 from 3662, we get 80.
Take the next digit (7) from the dividend and append it to 80, then repeat: 807 / 398

Let's proceed to step 6:
The number 398 fits into 807 2 times, leaving a remainder of 11.
The next digit of our result is 2. 
Result so far: 392.0
If we subtract 796 from 807, we get 11.
Take the next digit (2) from the dividend and append it to 11, then repeat: 112 / 398

Moving on to step 7:
398 can be fit into 112 0 times, resulting in a remainder of 112.
The number 0 becomes the next digit in our result. 
Result so far: 3920.0
Subtract 0 from 112 to get 112.
Include the next digit (1) from the dividend after 112, then repeat: 1121 / 398

On to step 8:
398 goes into 1121 2 times with a remainder of 325.
The next digit of our result is 2. 
Result so far: 39202.0
If we take 796 away from 1121, we end up with 325.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3250, and continue the process.

On to step 9:
If we divide 3250 by 398, we get 8 and a remainder of 66.
The number 8 becomes the next digit in our result. 
Result so far: 39202.8
If we subtract 3184 from 3250, we get 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

On to step 10:
When dividing 660 by 398, we get 1 with a remainder of 262.
The next digit of our result is 1. 
Result so far: 39202.81
If we subtract 398 from 660, we get 262.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2620, and continue the process.

Let's proceed to step 11:
398 goes into 2620 6 times with a remainder of 232.
Record the quotient 6 as the next digit in the result. 
Result so far: 39202.816
Deduct 2388 from 2620 and we're left with 232.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2320, and continue the process.

Moving on to step 12:
398 goes into 2320 5 times with a remainder of 330.
The number 5 becomes the next digit in our result. 
Result so far: 39202.8165
Deduct 1990 from 2320 and we're left with 330.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3300, and continue the process.

Moving on to step 13:
398 can be fit into 3300 8 times, resulting in a remainder of 116.
Put 8 as the next digit of the answer. 
Result so far: 39202.81658
Subtracting 3184 from 3300 leaves us 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.

Let's proceed to step 14:
398 goes into 1160 2 times with a remainder of 364.
The number 2 becomes the next digit in our result. 
Result so far: 39202.816582
The remainder is 364 after subtracting 796 from 1160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3640, and continue the process.

Moving on to step 15:
When dividing 3640 by 398, we get 9 with a remainder of 58.
Record the quotient 9 as the next digit in the result. 
Result so far: 39202.8165829
Subtracting 3582 from 3640 leaves us with 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Advancing to step 16:
398 goes into 580 1 times with a remainder of 182.
Use 1 as the next digit of our solution. 
Result so far: 39202.81658291
The remainder is 182 after subtracting 398 from 580.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1820, and continue the process.

Our division results in 39202.81658291 with a remaining 1.82e-07.