Which of the following is an example of a perfect square?

Which of the following is an example of a perfect square?

مندرجہ ذیل میں سے کون سا ایک کامل مربع کی مثال ہے؟
Explanation

A perfect square is a number that can be expressed as the product of an integer multiplied by itself.

Out of the given options:

18 is not a perfect square because it cannot be expressed as the product of an integer multiplied by itself.

27 is not a perfect square because it cannot be expressed as the product of an integer multiplied by itself.

30 is not a perfect square because it cannot be expressed as the product of an integer multiplied by itself.

36 is a perfect square because it can be expressed as 6×6=36, where 6 is an integer.