Squares of prime numbers have only three factors.
Composite numbers
Numbers with exactly three factors are squares of prime 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.
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.
Prime numbers have two factors. Prime squares have three factors. Square numbers have an odd number of factors but that number varies.
Numbers with three factors are squares of primes. So: 4, 9, 25
Yes. Square numbers have an odd number of factors. 49 has three factors.
Prime numbers have two and only two factors. Composite numbers have three or more.
Prime numbers have two factors. 2, 3 and 5 are prime numbers.