Question

Write the truth value
(i) $9$ is a perfect square but $11$ is prime number.

Answer 1

As,

$9=3\times 3=(-3)\times (-3)$

$⟹\sqrt{9}=\pm 3$

Hence, $9$ is a perfect square.

And, $11$ is only divisible by $1$ and itself. So, $11$ is a prime number.