SOLUTION: how to determine if the number 5240365220553 is a square number

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Question 427617: how to determine if the number 5240365220553 is a square number
Answer by Alan3354(69443) About Me  (Show Source):
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Square numbers end in 0, 1, 4, 5, 6 or 9.
This is not one, its LS digit is 3.