the last digit 1 digit of a perfect square number can never be
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ex:,400,100,900
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E.g. 100,400,900 all are Perfect Square having unit digit 0 and tens digit is 0. – If a number ends with 2, 3, 7 or 8 then it can't be perfect square. 88 we get 7744. You can notice that last two digits are 44, which are same as last two digits of the square of 12 i.e. 144.
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