To find the factors of the number 36 you will have to find the two numbers which give a product of 36. This means that when you multiply 2 numbers they will give a product of 36.
So let us start with the process:

1×36=36
2×18=36
3×12=36
4×9=36

So you can see that the factors of 36 are 1, 2, 3, 4, 9, 12, 18 and 36.