Is 10 a prime or composite?

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Is 10 a prime or composite?

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Answer 1 · 2018-03-03T02:33:48

$10$ is a composite number.

Explanation:

To check if a number $n$ is prime, test if $n$ is divisible from any of the numbers from $2$ all the way up to $sqrtn$ . If $n$ isn't divisible, by any of the numbers, then $n$ is prime.

For $10$ , we want to test all the whole numbers between $2$ and $sqrt10$ which is about $3.2$ . We will need to test $2$ and $3$ :

Is $10$ divisible by $2$ ?

Yes, because $10div2=5$ .

This fact is enough to prove that $10$ is not prime, so we can stop now. This means that $10$ is composite.

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Is 10 a prime or composite?

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