606621 ÷ 90 
We want to figure out the number of times 606621 can be divided by 90.

Advancing to step 1:
If we divide 6 by 90, we get 0 and a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Bring next digit (0) of the dividend behind the 6 and repeat the process: 60 / 90

Going ahead to step 2:
60 divided by 90 is 0 with a remainder of 60.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 60, we get 60.
Fetch the next digit (6) from the dividend, attach it to 60 and continue: 606 / 90

Going ahead to step 3:
606 divided by 90 is 6 with a remainder of 66.
Put 6 as the next digit of the answer. 
Result so far: 6.0
Subtracting 540 from 606 leaves us with 66.
Fetch the next digit (6) from the dividend, attach it to 66 and continue: 666 / 90

On to step 4:
When dividing 666 by 90, we get 7 with a remainder of 36.
The number 7 becomes the next digit in our result. 
Result so far: 67.0
If we subtract 630 from 666, we get 36.
Grab the next digit (2) from the dividend, add it to 36, then carry on: 362 / 90

Moving on to step 5:
When dividing 362 by 90, we get 4 with a remainder of 2.
The next digit of our result is 4. 
Result so far: 674.0
Subtracting 360 from 362 leaves us with 2.
Include the next digit (1) from the dividend after 2, then repeat: 21 / 90

Advancing to step 6:
The number 90 fits into 21 0 times, leaving a remainder of 21.
The number 0 becomes the next digit in our result. 
Result so far: 6740.0
If we subtract 0 from 21, we get 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Advancing to step 7:
When dividing 210 by 90, we get 2 with a remainder of 30.
Use 2 as the next digit of our solution. 
Result so far: 6740.2
The remainder is 30 after subtracting 180 from 210.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Moving on to step 8:
If we divide 300 by 90, we get 3 and a remainder of 30.
Put 3 as the next digit of the answer. 
Result so far: 6740.23
Deduct 270 from 300 and we're left with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Step 9:
When dividing 300 by 90, we get 3 with a remainder of 30.
Use 3 as the next digit of our solution. 
Result so far: 6740.233
The remainder is 30 after subtracting 270 from 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

The final result is 6740.233 with a remainder of 0.003.