A perfect square is a number made by squaring a whole number.
It can also be described as the product of a whole number and itself.
Among the numbers given, you'll notice that only the number 36 suits the definition above:
![\begin{gathered} 36=6*6 \\ OR \\ 36=6^2 \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/college/7zmsc8130i8neblgfhsfqpytvnlr3jsrf2.png)
It can be written as square of a whole number or the product of a whole number and itself. In this case its the number 6.
So the right answer is 36.