Question

Which among the following is a composite number?

• A. $5$
• B. $37$
• C. $19$
• D. $111$

Answer 1

The correct option is D $111$

The numbers that have the factor(s) other than $1$ and the number itself are called composite numbers. Hence, composite numbers have more than two factors.

$\bullet$ In option (a.), $5$ has the factors as $1$ and $5$ only. So, $5$ is NOT a composite number.

$\bullet$ In option (b.), $37$ has the factors as $1$ and $37$ only. So, $37$ is NOT a composite number.

$\bullet$ In option (c.), $19$ has the factors as $1$ and $19$ only. So, $19$ is NOT a composite number.

$\bullet$ In option (d.), $111$ has the factors as $1$ , $3$ , $37$ and $111$. Hence, $111$ has the factors $(3,37)$ other than $1$ and the number itself.
$\therefore \underset{–}{111\text{is a composite number}}.$

Therefore, option (d.) is the correct answer.