Can someone please help me with this I don’t get it

i'll show you how to do it.

Step-by-step explanation:

Is there any number that multiplied by itself gives you one of the options obove?

Example:

81 = 9×9... So it is a perfect square

36 = 6x6... It's a perfect square too

27 = ther isn't a number that multipied by itself is equal to 27... Then, it is not a perfect square

b,c,e,f is perfect square and other are not a perfect square

unknown

Step-by-step explanation: