A number multiplied by itself is a square number as for example 6*6 = 36
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64 is a perfect square number.
4000 is a square number but it is not the square of an integer so it is not a perfect square number.
2 is a square number but, because it is not a square of an integer, it is not a perfect square.
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Assuming squre is supposed to be square. How many squre metres in a kilometre? 1,000. Right? The area of a squre is? A x B. Right? So that's 1,000 x 1,000. Right? Which is? 1 million squre metres. Right? It's not rocket science. How old are you? 3!