why 15000 is not a perfect square
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So now we know the digital root of 15,000 is 6. Is 6 in the list of digital roots that are always a square root (1, 4, 7 or 9)? Answer: NO, 6 is not in the list of digital roots that are always perfect squares. We can conclude that 15,000 IS NOT a perfect square and we don't need to factor!
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