Are every number ending with 1, 4, 5, 9, and 0 a perfect square?
Solution :
No, not all numbers ending with 0,1,4,5 and 0 are perfect squares.
All perfect squares end in 1, 4, 5, 6, 9, or 00 (even number of zeros). Therefore, a number that ends in 2, 3, 7, or 8 is not a perfect square.
For example,
101,104,105,106, 109 and 110 are not perfect squares.
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