Square numbers end with one of the following numbers in the unit place
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If a number has 1 or 9 in its units place, then its square ends in 1. When a square number ends in 6, then its square root will have 4 or 6 in its unit's place. Square numbers can only have even number of zeroes at the end.
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Answer:
2 1764
7 49
7 7
1
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