Because its square root is not an integer.
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200 is not a perfect square. Its square root is a fraction and the square root of a perfect square is always an integer.
A perfect square is a square of an integer (a whole number).
Then the number is called a "perfect square".Then the number is called a "perfect square".Then the number is called a "perfect square".Then the number is called a "perfect square".
No, 15 is not a perfect square.
No, but a perfect square is usually the square of a whole number.