There are an infinite number of prime squares.
Three. The prime numbers (factors) of 120 are: 2,3,5
Three. The prime numbers (factors) of 60 are: 2,3,5
Squares of prime numbers have only three factors.
There are three of them with exactly five factors.
Three numbers.
Factors don't have numbers. Numbers have factors. Numbers that have the factors 2, 4 and 8 are 8 and all of its multiples.
Composite numbers
Numbers with exactly three factors are squares of prime numbers.
The numbers with only three factors are squares of prime numbers.
Squares of prime numbers have exactly three factors.
There are no prime numbers with three factors. By definition, a prime number has exactly two factors - 1 and itself.
Composite numbers have three or more factors.