Question

164 are not perfect squares?give reason​

Answer 1

Answer:

So now we know the digital root of 164 is 2. Is 2 in the list of digital roots that are always a square root (1, 4, 7 or 9)? Answer: NO, 2 is not in the list of digital roots that are always perfect squares. We can conclude that 164 IS NOT a perfect square and we don't need to factor!