Let's divide 660531 by 4
The aim is to understand the frequency of 4 in 660531.

Advancing to step 1:
6 divided by 4 is 1 with a remainder of 2.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtracting 4 from 6 leaves us with 2.
Bring next digit (6) of the dividend behind the 2 and repeat the process: 26 / 4

Going ahead to step 2:
4 goes into 26 6 times with a remainder of 2.
Put 6 as the next digit of the answer. 
Result so far: 16.0
Subtracting 24 from 26 leaves us with 2.
Take the next digit (0) from the dividend and append it to 2, then repeat: 20 / 4

Moving on to step 3:
20 divided by 4 is 5 with a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 165.0
If we take 20 away from 20, we end up with 0.
Grab the next digit (5) from the dividend, add it to 0, then carry on: 5 / 4

Moving on to step 4:
5 divided by 4 is 1 with a remainder of 1.
Record the quotient 1 as the next digit in the result. 
Result so far: 1651.0
The remainder is 1 after subtracting 4 from 5.
Grab the next digit (3) from the dividend, add it to 1, then carry on: 13 / 4

Advancing to step 5:
13 divided by 4 is 3 with a remainder of 1.
Write down 3 as next digit of the result. 
Result so far: 16513.0
The remainder is 1 after subtracting 12 from 13.
Fetch the next digit (1) from the dividend, attach it to 1 and continue: 11 / 4

Moving on to step 6:
4 goes into 11 2 times with a remainder of 3.
Put 2 as the next digit of the answer. 
Result so far: 165132.0
Deduct 8 from 11 and we're left with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Let's proceed to step 7:
30 divided by 4 is 7 with a remainder of 2.
Write down 7 as next digit of the result. 
Result so far: 165132.7
Subtract 28 from 30 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Moving on to step 8:
4 goes into 20 5 times with a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 165132.75
The remainder is 0 after subtracting 20 from 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 9:
If we divide 0 by 4, we get 0 and a remainder of 0.
The next digit of our result is 0. 
Result so far: 165132.75
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 10:
When dividing 0 by 4, we get 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 165132.75
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The quotient of the division is 165132.75, and the remainder is 0.0.