Question
If a number ends in 0, 1, 4, 5, 6, or 9, is it always a square?
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Answer
We cannot determine if a number is a square just by looking at the digit in the units place. But the unit digit can tell us when a number is not a square. If a number ends with 2, 3, 7, or 8, then we can say that it is not a square. For example, 26 ends in 6 but is not a perfect square.
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