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A perfect square is a rational number equal to the square of a whole number.
A perfect square is a whole number that can be named as a product of a number with itself.
When the whole number is a perfect square, ie it is a whole number squared.
You take the square root of the number. If it is a perfect square, this will be a whole number. If it is not, it isn't a perfect square.
Well, technically, it is the square of 11.18033989...but it is not a perfect square(a perfect square is the square of a whole number. 1,4,9,16,25,36,49,64,81,100,121,144,169,196,225,256, etc.)