Question

Which of the following numbers is a composite number?

Answer 1

Composite numbers are those numbers that have more than two factors.

Let's look at each option presented above.
$\to 1:$
Neither a prime nor a composite as it has only 1 factor, the number itself.

$\to 3:$
Not composite as 3 has only 2 factors, that is, 1 and the number itself.

$\to 2:$
Not composite as 2 has only 2 factors, that is, 1 and the number itself.

$\to 9:$
Composite as 9 has 3 factors, that is, 1, 3, and 9.

Hence, the correct option is 9.