90 is a not perfect square.
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Yes. In general, if an integer is not a perfect square, its square root is irrational.
Yes it is.Since the square of an integer is called a perfect square, then the square root of a perfect square must be an integer.
an integer
The integer is 26
I have never before heard of a non-perfect square but I suppose it would be any non-zero number that is not the square of an integer. People sometimes say "perfect square" to mean an integer that is a square of an integer - I think the "perfect" is redundant but if you do not think "square" is clear by itself, say "integer square."