Which of the following is an example of a prime number?

A prime number is defined as a natural number greater than 1 that has no positive divisors other than 1 and itself. This means that a prime number can only be divided evenly (with no remainder) by 1 and the number itself.

In this case, the number 7 fits the definition of a prime number. It is greater than 1 and it cannot be divided evenly by any other numbers except for 1 and 7. This characteristic makes it a prime number.

In contrast, the other numbers mentioned have additional divisors. For example, 4 can be divided by 1, 2, and 4; 6 can be divided by 1, 2, 3, and 6; and 8 can be divided by 1, 2, 4, and 8. Since these numbers have divisors other than 1 and themselves, they do not qualify as prime numbers. Thus, 7 stands out as the only prime number among the choices given.