Question

Show that 3200 is not a perfect square​

Answer 1

Answer:

So now we know the digital root of 3,200 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 3,200 IS NOT a perfect square and we don't need to factor!