why all square numbers are perfect squares and but all perfect squares are not square number?
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Please note that all the perfect square numbers end with 0, 1, 4, 5, 6 or 9 but all the numbers with end with 0, 1, 4, 5, 6 or 9 are not perfect square numbers. Example, 11, 21, 51, 79, 76 etc. are the numbers which are not perfect square numbers. ... Example 62411 ends with 1 but it is not a perfect square number.
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