Question

numbers which are not perfect squares are?​

Answer 1

1, 4, 9, 16, 25, 36, 49, 64, 81, 100, 121, 144, 169, 196, 225, 256, 289, 324, 361 and 400. and you will find that all of them are ending with 0, 1, 4, 5, 6 or 9. So it means that all the non-perfect square numbers end with 2, 3, 7 or 8.

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