We're dividing 623909 by 54 
The aim is to understand the frequency of 54 in 623909.

Advancing to step 1:
6 divided by 54 is 0 with a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Take the next digit (2) from the dividend and append it to 6, then repeat: 62 / 54

Advancing to step 2:
62 divided by 54 is 1 with a remainder of 8.
The next digit of our result is 1. 
Result so far: 1.0
Subtract 54 from 62 to get 8.
Fetch the next digit (3) from the dividend, attach it to 8 and continue: 83 / 54

Going ahead to step 3:
54 goes into 83 1 times with a remainder of 29.
Use 1 as the next digit of our solution. 
Result so far: 11.0
The remainder is 29 after subtracting 54 from 83.
Grab the next digit (9) from the dividend, add it to 29, then carry on: 299 / 54

On to step 4:
54 can be fit into 299 5 times, resulting in a remainder of 29.
The number 5 becomes the next digit in our result. 
Result so far: 115.0
The remainder is 29 after subtracting 270 from 299.
Append the next digit (0) from the dividend to 29 and continue with: 290 / 54

Moving on to step 5:
If we divide 290 by 54, we get 5 and a remainder of 20.
The number 5 becomes the next digit in our result. 
Result so far: 1155.0
The remainder is 20 after subtracting 270 from 290.
Bring next digit (9) of the dividend behind the 20 and repeat the process: 209 / 54

Advancing to step 6:
When dividing 209 by 54, we get 3 with a remainder of 47.
The next digit of our result is 3. 
Result so far: 11553.0
The remainder is 47 after subtracting 162 from 209.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

Step 7:
470 divided by 54 is 8 with a remainder of 38.
The next digit of our result is 8. 
Result so far: 11553.8
If we take 432 away from 470, we end up with 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Step 8:
The number 54 fits into 380 7 times, leaving a remainder of 2.
The next digit of our result is 7. 
Result so far: 11553.87
If we take 378 away from 380, we end up with 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 9:
54 goes into 20 0 times with a remainder of 20.
Write down 0 as next digit of the result. 
Result so far: 11553.87
Deduct 0 from 20 and we're left with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 10:
The number 54 fits into 200 3 times, leaving a remainder of 38.
Put 3 as the next digit of the answer. 
Result so far: 11553.8703
If we take 162 away from 200, we end up with 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Step 11:
The number 54 fits into 380 7 times, leaving a remainder of 2.
Use 7 as the next digit of our solution. 
Result so far: 11553.87037
The remainder is 2 after subtracting 378 from 380.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Moving on to step 12:
When dividing 20 by 54, we get 0 with a remainder of 20.
The number 0 becomes the next digit in our result. 
Result so far: 11553.87037
Subtracting 0 from 20 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Let's proceed to step 13:
If we divide 200 by 54, we get 3 and a remainder of 38.
The number 3 becomes the next digit in our result. 
Result so far: 11553.8703703
Subtracting 162 from 200 leaves us with 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Step 14:
The number 54 fits into 380 7 times, leaving a remainder of 2.
Write down 7 as next digit of the result. 
Result so far: 11553.87037037
If we take 378 away from 380, we end up with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

The quotient of the division is 11553.87037037, and the remainder is 2e-09.