Prime numbers have exactly two factors.All prime numbers have only 2 factors whereas composite numbers have more than 2 factors
Prime numbers have exactly two factors. 53 and 59 are prime numbers.
The squares of all prime numbers above 2 have exactly 3 factors.
2 and 3
Squares of prime numbers have exactly three factors.
Numbers with exactly three factors are squares of prime numbers.
2 4 6
All numbers that are the square of primes have exactly 3 factors.