27
There are an infinite number of them. 8 has three prime factors, 30 is the first with three distinct prime factors.
A number has exactly three factors if and only if it is the square of a prime number.
A square of any prime number, p has exactly three factors. They are 1, p and p^2.
By definition, a prime number has exactly two factors. So, there are no prime numbers with exactly three factors.
30
There are no prime numbers with three factors. By definition, a prime number has exactly two factors - 1 and itself.
There are an infinite number of them. 8 has three prime factors, 30 is the first with three distinct prime factors.
All prime squares have exactly three factors.49 has exactly three factors: 1, 7, and 49.
How about 105 whose prime factors are 3, 5 and 7
A prime number has exactly two factors, one and itself. 25 has three factors: 1, 5, and 25.
Any composite number. Examples: 4 and 9 . . . (three factors) 6, 8, and 10 . . . (four factors) 12 . . . (six factors) 60 . . . (twelve factors)
The square of any prime number has exactly three factors: 22, 32, 52, etc.