show that 3650 is not a perfect square
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So now we know the digital root of 3,650 is 5. Is 5 in the list of digital roots that are always a square root (1, 4, 7 or 9)? Answer: NO, 5 is not in the list of digital roots that are always perfect squares. We can conclude that 3,650 IS NOT a perfect square and we don't need to factor
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