64 is a perfect square number.
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4000 is a square number but it is not the square of an integer so it is not a perfect square number.
A number multiplied by itself is a square number as for example 6*6 = 36
2 is a square number but, because it is not a square of an integer, it is not a perfect square.
64 is a square number; 8x8 = 64.
Even number Rational number Composite number As a fraction: 64/1 As a decimal: 64.0 82 = 64 26 = 64