We look at the division of 1628886 by 497 
The aim is to understand the frequency of 497 in 1628886.

Step 1:
1 divided by 497 is 0 with a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Include the next digit (6) from the dividend after 1, then repeat: 16 / 497

On to step 2:
497 goes into 16 0 times with a remainder of 16.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 16 and we're left with 16.
Include the next digit (2) from the dividend after 16, then repeat: 162 / 497

Step 3:
The number 497 fits into 162 0 times, leaving a remainder of 162.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 162 leaves us with 162.
Include the next digit (8) from the dividend after 162, then repeat: 1628 / 497

Let's proceed to step 4:
If we divide 1628 by 497, we get 3 and a remainder of 137.
Put 3 as the next digit of the answer. 
Result so far: 3.0
If we take 1491 away from 1628, we end up with 137.
Append the next digit (8) from the dividend to 137 and continue with: 1378 / 497

Moving on to step 5:
497 goes into 1378 2 times with a remainder of 384.
The number 2 becomes the next digit in our result. 
Result so far: 32.0
Subtract 994 from 1378 to get 384.
Include the next digit (8) from the dividend after 384, then repeat: 3848 / 497

Moving on to step 6:
If we divide 3848 by 497, we get 7 and a remainder of 369.
Use 7 as the next digit of our solution. 
Result so far: 327.0
Subtract 3479 from 3848 to get 369.
Append the next digit (6) from the dividend to 369 and continue with: 3696 / 497

On to step 7:
If we divide 3696 by 497, we get 7 and a remainder of 217.
Use 7 as the next digit of our solution. 
Result so far: 3277.0
If we take 3479 away from 3696, we end up with 217.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2170, and continue the process.

On to step 8:
If we divide 2170 by 497, we get 4 and a remainder of 182.
The next digit of our result is 4. 
Result so far: 3277.4
If we subtract 1988 from 2170, we get 182.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1820, and continue the process.

On to step 9:
497 can be fit into 1820 3 times, resulting in a remainder of 329.
The number 3 becomes the next digit in our result. 
Result so far: 3277.43
Subtracting 1491 from 1820 leaves us with 329.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3290, and continue the process.

Advancing to step 10:
3290 divided by 497 is 6 with a remainder of 308.
Write down 6 as next digit of the result. 
Result so far: 3277.436
If we take 2982 away from 3290, we end up with 308.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3080, and continue the process.

Let's proceed to step 11:
If we divide 3080 by 497, we get 6 and a remainder of 98.
The number 6 becomes the next digit in our result. 
Result so far: 3277.4366
Subtracting 2982 from 3080 leaves us with 98.
Since there are no more digits in the dividend, we add a zero to the remainder making it 980, and continue the process.

The final result is 3277.4366 with a remainder of 0.00098.