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

A composite number is defined as a positive integer that has at least one positive divisor other than one and itself, meaning it can be divided evenly by numbers other than just 1 and itself.

In this instance, the number 4 qualifies as a composite number because it can be divided by 1, 2, and 4. Specifically, it can be expressed as 2 multiplied by 2, showing that it has divisors besides just 1 and itself.

The other numbers presented, such as 3, 5, and 7, are all prime numbers. A prime number has only two distinct positive divisors: 1 and itself. Therefore, since 4 meets the criteria for being a composite number while the other numbers do not, it is the correct choice in this context.