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No, all perfect square numbers are not even numbers.

Eg. the square of 3 is 9. (32=9)

To generalize the proof:

If p is odd then p=2n+1 and p2=(2n+1)2=4n2+4n+1=2(2n2+2n)+1

So odd numbers have odd square

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Q: Are all perfect square number are even numbers?
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