Is 57 composite?

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Answer 1 · 2018-04-12T20:32:31

Yes

A composite number is a number expressible as the product of two numbers apart from $1$ (or $-1$ ) and itself (or minus itself).

So in the case of $57$ , we are looking for a factorisation other than the trivial $57 = 1 * 57$ (or $57 = (-1) * (-57)$ ).

Note that $5+7 = 12$ which is divisible by $3$ .

So we can deduce that $57$ is divisible by $3$ .

In fact:

$57 = 3 * 19$

So $57$ is expressible as the product of two non-trivial factors and is therefore composite.

Answer 2 · 2018-04-12T20:38:03

yes

$57 = 19 * 3$

$57$ is the product of $19$ and $3$ .

this means that $57$ can be written as the product of two numbers, neither of which are $1$ (or $0$ ).

a composite number is a positive integer (a whole number greater than $0$ ) that has at least one divisor other than $1$ and itself.

only composite numbers can be written as the product of two positive integers, neither of which are $1$ .

as the product of $19$ and $3$ , $57$ is composite.

Answer 3 · 2018-04-20T15:50:36

Yes.

$57$ is a composite number.

$57$ is a composite number because it has more factors other than $1$ and $57$ .

Also $57$ can be uniquely expressed as a product of its Prime factors :-

$57 = 3^(1).19^1$