What is a characteristic of a prime number?

A prime number is defined as a natural number greater than 1 that has exactly two distinct positive divisors: one and itself. This definition distinguishes prime numbers from composite numbers, which have more than two factors. For example, the number 5 is prime because it can only be divided evenly by 1 and 5.

The other options do not align with the definition of a prime number. A prime number cannot be evenly divided by three (unless it is the number three itself), it is always greater than zero, and while the number two is a prime number and the only even prime, most prime numbers are odd. Thus, the defining characteristic of having exactly two factors is what makes the second option the correct answer.