25614613 ÷ 648 
The aim is to understand the frequency of 648 in 25614613.

Advancing to step 1:
If we divide 2 by 648, we get 0 and a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Include the next digit (5) from the dividend after 2, then repeat: 25 / 648

Advancing to step 2:
If we divide 25 by 648, we get 0 and a remainder of 25.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 25 leaves us with 25.
Take the next digit (6) from the dividend and append it to 25, then repeat: 256 / 648

Step 3:
The number 648 fits into 256 0 times, leaving a remainder of 256.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 256 leaves us with 256.
Take the next digit (1) from the dividend and append it to 256, then repeat: 2561 / 648

Advancing to step 4:
When dividing 2561 by 648, we get 3 with a remainder of 617.
The next digit of our result is 3. 
Result so far: 3.0
If we subtract 1944 from 2561, we get 617.
Take the next digit (4) from the dividend and append it to 617, then repeat: 6174 / 648

On to step 5:
648 can be fit into 6174 9 times, resulting in a remainder of 342.
Record the quotient 9 as the next digit in the result. 
Result so far: 39.0
The remainder is 342 after subtracting 5832 from 6174.
Include the next digit (6) from the dividend after 342, then repeat: 3426 / 648

Advancing to step 6:
When dividing 3426 by 648, we get 5 with a remainder of 186.
The number 5 becomes the next digit in our result. 
Result so far: 395.0
The remainder is 186 after subtracting 3240 from 3426.
Grab the next digit (1) from the dividend, add it to 186, then carry on: 1861 / 648

Step 7:
If we divide 1861 by 648, we get 2 and a remainder of 565.
Put 2 as the next digit of the answer. 
Result so far: 3952.0
Subtracting 1296 from 1861 leaves us with 565.
Append the next digit (3) from the dividend to 565 and continue with: 5653 / 648

Moving on to step 8:
648 goes into 5653 8 times with a remainder of 469.
The number 8 becomes the next digit in our result. 
Result so far: 39528.0
Deduct 5184 from 5653 and we're left with 469.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4690, and continue the process.

Let's proceed to step 9:
648 goes into 4690 7 times with a remainder of 154.
Write down 7 as next digit of the result. 
Result so far: 39528.7
If we subtract 4536 from 4690, we get 154.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1540, and continue the process.

Let's proceed to step 10:
If we divide 1540 by 648, we get 2 and a remainder of 244.
The number 2 becomes the next digit in our result. 
Result so far: 39528.72
Subtracting 1296 from 1540 leaves us with 244.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2440, and continue the process.

On to step 11:
648 can be fit into 2440 3 times, resulting in a remainder of 496.
The next digit of our result is 3. 
Result so far: 39528.723
Subtracting 1944 from 2440 leaves us with 496.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4960, and continue the process.

Advancing to step 12:
If we divide 4960 by 648, we get 7 and a remainder of 424.
Write down 7 as next digit of the result. 
Result so far: 39528.7237
Deduct 4536 from 4960 and we're left with 424.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4240, and continue the process.

Moving on to step 13:
4240 divided by 648 is 6 with a remainder of 352.
The next digit of our result is 6. 
Result so far: 39528.72376
If we subtract 3888 from 4240, we get 352.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3520, and continue the process.

Going ahead to step 14:
The number 648 fits into 3520 5 times, leaving a remainder of 280.
Record the quotient 5 as the next digit in the result. 
Result so far: 39528.723765
Subtracting 3240 from 3520 leaves us with 280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2800, and continue the process.

Let's proceed to step 15:
When dividing 2800 by 648, we get 4 with a remainder of 208.
Write down 4 as next digit of the result. 
Result so far: 39528.7237654
If we take 2592 away from 2800, we end up with 208.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2080, and continue the process.

Advancing to step 16:
648 can be fit into 2080 3 times, resulting in a remainder of 136.
The next digit of our result is 3. 
Result so far: 39528.72376543
Subtracting 1944 from 2080 leaves us with 136.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1360, and continue the process.

The quotient of the division is 39528.72376543, and the remainder is 1.36e-07.