Is 315 a composite or prime number?

Answer 1

Prime numbers have only two factors, one and itself. The number 315 is a compositenumber because it has more factors than 1 and itself. You can find the factors of a number by starting with 1 and going on through the numbers until all the facors of a number are found. Like this:

1 X 315

2 will not divide evenly into 315, so is not a factor. No even numbers are factors of 315.

3 X 105

5 X 63

7 X 45

9 X 35

15 X 21

Listed in order, the factors of 315 are 1, 3, 5, 7, 9, 15, 21, 35, 45, 63, 105, 315.