105, 210, 315
There are no prime numbers with three factors. By definition, a prime number has exactly two factors - 1 and itself.
Start with the factors. Multiply combinations of three prime factors, then combinations of five, then seven, etc. All generated numbers will be guaranteed to have an odd number of prime factors.
Squares of prime numbers have only three factors.
Prime numbers have two factors. Prime squares have three factors. Square numbers have an odd number of factors but that number varies.
Prime numbers have two factors. 2, 3 and 5 are prime numbers.
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 exactly three factors.
56 does not have only three prime factors.
There are an infinite number of them. 8 has three prime factors, 30 is the first with three distinct prime factors.
Numbers with exactly three factors are squares of prime numbers.