Answer :

All the numbers from 400 to 425 which end in 2, 3, 7 or 8 are


402, 403, 407, 408, 412, 413, 417, 418, 422, 423


We know that every square has one of these as its unit place digit 1, 4, 9, 6, 5, 0. So, none of these is a perfect square.


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