odd-slash-even-number-of-divisors

Odd/Even number of divisors

Given an integer n return 'odd' if the number of its divisors is odd. Otherwise return 'even'.

Example

All prime numbers have exactly two divisors (hence 'even')

For n=12 the divisors are [1,2,3,4,6,12] – 'even'

For n=4 the divisors are [1,2,4] – 'odd'