A square root is the little 2 at the top of a number so when you square a number it means you are multiplying how many is squared of that same number. And a perfect square is when you have a certain square that is given with how much their is in that square and then you use a radicand for that number equals how many that was square rooted so lets say the given square is 81 then ur perfect square would be 9^2.
Hope this helped!!