30 is the first with three distinct prime factors.
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There are an infinite number of them. 8 has three prime factors, 30 is the first with three distinct prime factors.
A square of a prime.
Okay, whoever said that a number can only have an even number of factors IS Wrong Take a prime number and square it. If you square a prime number, the number you get will only have 3 factors. For example, if I squared the number 3, I would get 9. 9 only has three factors: 9, 3, 1 Any prime number squared has Three factors.
53 is a prime because its only factors are 1 and itself.
A square of any prime number, p has exactly three factors. They are 1, p and p^2.