Question

Is 525 a prime or composite number?

Answer 1

`525` is a composite number.

Explanation:

While prime numbers do not have any factor other than `1` and the number itself, composite numbers do have factors other than `1` and the number itself. Note here, the number itself means `525`.

As `525` is clearly divisible by `5` (last digit being one of 5 or 0) as also by `3` (as sum of digits is 12 divisible by 3), `525` is divisible both by `3` and `5` as well as `15`.

Hence `525` is a composite number.

In fact `525` has its factor as `{1,3,5,7,15,21,25,35,75,105,175,525}`