Which square root is not a whole number?

Answer: 156

Step-by-step explanation:

You didn't provide me with enough information but here is what I found,

A perfect square is the product of a whole number multiplied by itself. Since 156 is between those two numbers its square root cannot be a whole number.

Square root of 156 is 12.5 which is not a whole number. Square root of 169 is 13. So It is a perfect square.