# Is 25 a composite number?

Apr 16, 2016

Yes

#### Explanation:

25 has more factors than just 1 and 25 making it composite.

The list of factors that it has is 1, 5, and 25.

Apr 16, 2016

A composite number is a product of prime numbers.
So to answer your question. Yes as it is a product of two primes.
That is the prime 5$\to 5 \times 5 = 25$

#### Explanation:

A prime number is a number that can only be divided by 1 and itself and no other whole number to give a whole number answer.

Any number that is a product of primes is a composite number.

Consider the prime factor tree: 3 and 79 are primes in that they can only be divided by themselves and 1 to give whole number answers.

But $3 \times 79 = 237$ so 237 is composite

Hear is another composite split into its prime factors So the composite 638 is a product of the prime {2,11,29}

In that $2 \times 11 \times 29 = 638$

I quick search on the internet will lists of prime numbers. If you can it is a good idea to try and remember some of them. In England schools encourage the remembering the primes numbers up 97