2609156 divided by 991 
The aim is to understand the frequency of 991 in 2609156.

On to step 1:
If we divide 2 by 991, we get 0 and a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Grab the next digit (6) from the dividend, add it to 2, then carry on: 26 / 991

On to step 2:
26 divided by 991 is 0 with a remainder of 26.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 26, we end up with 26.
Fetch the next digit (0) from the dividend, attach it to 26 and continue: 260 / 991

Step 3:
991 can be fit into 260 0 times, resulting in a remainder of 260.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 260 after subtracting 0 from 260.
Append the next digit (9) from the dividend to 260 and continue with: 2609 / 991

Step 4:
If we divide 2609 by 991, we get 2 and a remainder of 627.
Use 2 as the next digit of our solution. 
Result so far: 2.0
The remainder is 627 after subtracting 1982 from 2609.
Take the next digit (1) from the dividend and append it to 627, then repeat: 6271 / 991

Going ahead to step 5:
If we divide 6271 by 991, we get 6 and a remainder of 325.
Use 6 as the next digit of our solution. 
Result so far: 26.0
Subtracting 5946 from 6271 leaves us with 325.
Take the next digit (5) from the dividend and append it to 325, then repeat: 3255 / 991

Advancing to step 6:
991 goes into 3255 3 times with a remainder of 282.
The next digit of our result is 3. 
Result so far: 263.0
If we take 2973 away from 3255, we end up with 282.
Bring next digit (6) of the dividend behind the 282 and repeat the process: 2826 / 991

On to step 7:
The number 991 fits into 2826 2 times, leaving a remainder of 844.
The number 2 becomes the next digit in our result. 
Result so far: 2632.0
Deduct 1982 from 2826 and we're left with 844.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8440, and continue the process.

On to step 8:
8440 divided by 991 is 8 with a remainder of 512.
The number 8 becomes the next digit in our result. 
Result so far: 2632.8
If we subtract 7928 from 8440, we get 512.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5120, and continue the process.

Advancing to step 9:
If we divide 5120 by 991, we get 5 and a remainder of 165.
Write down 5 as next digit of the result. 
Result so far: 2632.85
Subtracting 4955 from 5120 leaves us with 165.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1650, and continue the process.

Moving on to step 10:
When dividing 1650 by 991, we get 1 with a remainder of 659.
The next digit of our result is 1. 
Result so far: 2632.851
Subtract 991 from 1650 to get 659.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6590, and continue the process.

Let's proceed to step 11:
991 can be fit into 6590 6 times, resulting in a remainder of 644.
The next digit of our result is 6. 
Result so far: 2632.8516
If we subtract 5946 from 6590, we get 644.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6440, and continue the process.

Step 12:
When dividing 6440 by 991, we get 6 with a remainder of 494.
The next digit of our result is 6. 
Result so far: 2632.85166
If we subtract 5946 from 6440, we get 494.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4940, and continue the process.

The final outcome is 2632.85166, with a leftover of 0.000494.