30, 42, 66, 70 and 78.
A prime number is a positive integer that has exactly two different factors: 1 and itself. This is why 1 is not a prime number: it has the factors 1 and itself, but they are the same - it does not have exactly two different factors.
Yes.
Squares of prime numbers have exactly three factors.
By definition, a prime number has exactly two factors. So, there are no prime numbers with exactly three factors.
There are an infinite number of them. 8 has three prime factors, 30 is the first with three distinct prime factors.
That is correct -- all prime numbers have exactly two factors.
Numbers with exactly three factors are squares of prime numbers.
None. Prime numbers only have two factors.
Prime numbers.
Take any 5 prime numbers and multiply them together.
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.