Question

Which type of number is 72?

• A. Prime number
• B. Perfect square
• C. Composite number
• D. (b) and (c) above.

Answer 1

The correct option is C Composite number

72 can be factorised as:
72 = $2\times 2\times 2\times 3\times 3$ = $2^3\times 3^2$
$⟹$ 72 is a composite number but not a perfect square.