Given a positive number x:
p = (p1, p2, …)
# Set of *prime* factors of x
If the square of every item in p is also a factor of x, then x is said to be a powerful number.
Create a function that takes a number and returns True if it's powerful, False if it's not.
is_powerful(36) ➞ True
# p = (2, 3) (prime factors of 36)
# 2^2 = 4 (factor of 36)
# 3^2 = 9 (factor of 36)
is_powerful(27) ➞ True
is_powerful(674) ➞ False
N/A