Here we will answer the question: "Is 4 a square number?" You could also ask "Is 4 a perfect square?" Square number and perfect square mean the same thing.
Anyway, for 4 to be a square number, 4 must be the product of an integer multiplied by itself. In other words, the square root of 4 must equal a whole number (integer).
The square root of 4 is 2 which is an integer. Thus, 4 is a square number.
The answer to the question: "Is 4 a square number?" is Yes.
The answer to the question: "Is 4 a perfect square?" is also Yes.
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