following numbers are obviously not perfect square give reason 1057,23453,7928,222222,64000,89722,222000,505050
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because only numbers ending in 1,4,5,6,9 are perfect squares
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in perfect square the digit in the last place are always 0, 1, 4, 5,9
But 64000, 22000 and 505050 are not perfect square because when number ends with zero it should have even zero at the end if last digit zero are in odd then it is not perfect square
64000 in this number there are 3 zeroes in last place which means 3 is a odd number so this is not peefect square
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