We look at the division of 22593898 by 644 
The aim is to understand the frequency of 644 in 22593898.

Let's proceed to step 1:
The number 644 fits into 2 0 times, leaving a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Bring next digit (2) of the dividend behind the 2 and repeat the process: 22 / 644

Step 2:
644 goes into 22 0 times with a remainder of 22.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 22, we end up with 22.
Take the next digit (5) from the dividend and append it to 22, then repeat: 225 / 644

Moving on to step 3:
644 goes into 225 0 times with a remainder of 225.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 225 to get 225.
Append the next digit (9) from the dividend to 225 and continue with: 2259 / 644

On to step 4:
644 goes into 2259 3 times with a remainder of 327.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
If we take 1932 away from 2259, we end up with 327.
Take the next digit (3) from the dividend and append it to 327, then repeat: 3273 / 644

Going ahead to step 5:
The number 644 fits into 3273 5 times, leaving a remainder of 53.
The number 5 becomes the next digit in our result. 
Result so far: 35.0
If we subtract 3220 from 3273, we get 53.
Append the next digit (8) from the dividend to 53 and continue with: 538 / 644

Moving on to step 6:
644 goes into 538 0 times with a remainder of 538.
Write down 0 as next digit of the result. 
Result so far: 350.0
Subtract 0 from 538 to get 538.
Grab the next digit (9) from the dividend, add it to 538, then carry on: 5389 / 644

Advancing to step 7:
5389 divided by 644 is 8 with a remainder of 237.
The next digit of our result is 8. 
Result so far: 3508.0
Subtract 5152 from 5389 to get 237.
Append the next digit (8) from the dividend to 237 and continue with: 2378 / 644

Step 8:
If we divide 2378 by 644, we get 3 and a remainder of 446.
Record the quotient 3 as the next digit in the result. 
Result so far: 35083.0
If we take 1932 away from 2378, we end up with 446.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4460, and continue the process.

Let's proceed to step 9:
When dividing 4460 by 644, we get 6 with a remainder of 596.
Write down 6 as next digit of the result. 
Result so far: 35083.6
If we subtract 3864 from 4460, we get 596.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5960, and continue the process.

Moving on to step 10:
644 can be fit into 5960 9 times, resulting in a remainder of 164.
The number 9 becomes the next digit in our result. 
Result so far: 35083.69
If we subtract 5796 from 5960, we get 164.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1640, and continue the process.

On to step 11:
1640 divided by 644 is 2 with a remainder of 352.
The number 2 becomes the next digit in our result. 
Result so far: 35083.692
Subtracting 1288 from 1640 leaves us with 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 12:
644 goes into 3520 5 times with a remainder of 300.
Record the quotient 5 as the next digit in the result. 
Result so far: 35083.6925
The remainder is 300 after subtracting 3220 from 3520.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3000, and continue the process.

Advancing to step 13:
If we divide 3000 by 644, we get 4 and a remainder of 424.
The next digit of our result is 4. 
Result so far: 35083.69254
If we subtract 2576 from 3000, we get 424.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4240, and continue the process.

Advancing to step 14:
When dividing 4240 by 644, we get 6 with a remainder of 376.
Put 6 as the next digit of the answer. 
Result so far: 35083.692546
The remainder is 376 after subtracting 3864 from 4240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3760, and continue the process.

Let's proceed to step 15:
The number 644 fits into 3760 5 times, leaving a remainder of 540.
Write down 5 as next digit of the result. 
Result so far: 35083.6925465
Subtract 3220 from 3760 to get 540.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5400, and continue the process.

Let's proceed to step 16:
644 can be fit into 5400 8 times, resulting in a remainder of 248.
Put 8 as the next digit of the answer. 
Result so far: 35083.69254658
Subtracting 5152 from 5400 leaves us with 248.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2480, and continue the process.

After the division, we end up with 35083.69254658 and a remainder of 2.48e-07.