Question

using the prime factorisation is 400 a perfect square​

Answer 1

Answer:

The prime factors have even powers hence 400 is a perfect square. One of the prime factors (3) has an odd power hence 768 is not a perfect square. Since the powers of the prime factors are even then 1296 is a perfect square. Since one of its prime factors has an odd power then 8000 is not a perfect square.