We're dividing 15139125 by 691 
The aim is to understand the frequency of 691 in 15139125.

Let's proceed to step 1:
691 goes into 1 0 times with a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Grab the next digit (5) from the dividend, add it to 1, then carry on: 15 / 691

Moving on to step 2:
15 divided by 691 is 0 with a remainder of 15.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 15, we end up with 15.
Take the next digit (1) from the dividend and append it to 15, then repeat: 151 / 691

Advancing to step 3:
If we divide 151 by 691, we get 0 and a remainder of 151.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 151, we end up with 151.
Include the next digit (3) from the dividend after 151, then repeat: 1513 / 691

Going ahead to step 4:
The number 691 fits into 1513 2 times, leaving a remainder of 131.
Write down 2 as next digit of the result. 
Result so far: 2.0
Deduct 1382 from 1513 and we're left with 131.
Include the next digit (9) from the dividend after 131, then repeat: 1319 / 691

Moving on to step 5:
1319 divided by 691 is 1 with a remainder of 628.
The number 1 becomes the next digit in our result. 
Result so far: 21.0
If we take 691 away from 1319, we end up with 628.
Append the next digit (1) from the dividend to 628 and continue with: 6281 / 691

Moving on to step 6:
691 can be fit into 6281 9 times, resulting in a remainder of 62.
Write down 9 as next digit of the result. 
Result so far: 219.0
If we take 6219 away from 6281, we end up with 62.
Take the next digit (2) from the dividend and append it to 62, then repeat: 622 / 691

Let's proceed to step 7:
If we divide 622 by 691, we get 0 and a remainder of 622.
The number 0 becomes the next digit in our result. 
Result so far: 2190.0
Deduct 0 from 622 and we're left with 622.
Include the next digit (5) from the dividend after 622, then repeat: 6225 / 691

Advancing to step 8:
691 can be fit into 6225 9 times, resulting in a remainder of 6.
The number 9 becomes the next digit in our result. 
Result so far: 21909.0
Subtract 6219 from 6225 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

On to step 9:
When dividing 60 by 691, we get 0 with a remainder of 60.
Write down 0 as next digit of the result. 
Result so far: 21909.0
The remainder is 60 after subtracting 0 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Advancing to step 10:
600 divided by 691 is 0 with a remainder of 600.
Put 0 as the next digit of the answer. 
Result so far: 21909.0
If we take 0 away from 600, we end up with 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6000, and continue the process.

After the division, we end up with 21909.0 and a remainder of 0.6.