68630146 ÷ 621 
The aim is to understand the frequency of 621 in 68630146.

Moving on to step 1:
When dividing 6 by 621, we get 0 with a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Grab the next digit (8) from the dividend, add it to 6, then carry on: 68 / 621

Going ahead to step 2:
The number 621 fits into 68 0 times, leaving a remainder of 68.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 68 leaves us with 68.
Take the next digit (6) from the dividend and append it to 68, then repeat: 686 / 621

Going ahead to step 3:
621 can be fit into 686 1 times, resulting in a remainder of 65.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we subtract 621 from 686, we get 65.
Bring next digit (3) of the dividend behind the 65 and repeat the process: 653 / 621

On to step 4:
653 divided by 621 is 1 with a remainder of 32.
Write down 1 as next digit of the result. 
Result so far: 11.0
If we take 621 away from 653, we end up with 32.
Grab the next digit (0) from the dividend, add it to 32, then carry on: 320 / 621

Moving on to step 5:
If we divide 320 by 621, we get 0 and a remainder of 320.
Put 0 as the next digit of the answer. 
Result so far: 110.0
Deduct 0 from 320 and we're left with 320.
Append the next digit (1) from the dividend to 320 and continue with: 3201 / 621

Moving on to step 6:
If we divide 3201 by 621, we get 5 and a remainder of 96.
Use 5 as the next digit of our solution. 
Result so far: 1105.0
Subtracting 3105 from 3201 leaves us with 96.
Take the next digit (4) from the dividend and append it to 96, then repeat: 964 / 621

Step 7:
If we divide 964 by 621, we get 1 and a remainder of 343.
The next digit of our result is 1. 
Result so far: 11051.0
Subtract 621 from 964 to get 343.
Include the next digit (6) from the dividend after 343, then repeat: 3436 / 621

Going ahead to step 8:
3436 divided by 621 is 5 with a remainder of 331.
Put 5 as the next digit of the answer. 
Result so far: 110515.0
Subtracting 3105 from 3436 leaves us with 331.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3310, and continue the process.

Let's proceed to step 9:
When dividing 3310 by 621, we get 5 with a remainder of 205.
The next digit of our result is 5. 
Result so far: 110515.5
The remainder is 205 after subtracting 3105 from 3310.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2050, and continue the process.

Advancing to step 10:
621 can be fit into 2050 3 times, resulting in a remainder of 187.
The next digit of our result is 3. 
Result so far: 110515.53
Subtracting 1863 from 2050 leaves us with 187.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1870, and continue the process.

Advancing to step 11:
621 goes into 1870 3 times with a remainder of 7.
The next digit of our result is 3. 
Result so far: 110515.533
If we take 1863 away from 1870, we end up with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

The quotient of the division is 110515.533, and the remainder is 0.0007.