Which of the following is an example of a perfect square?

A perfect square is a number that can be expressed as the product of an integer multiplied by itself. In this case, the number 4 fits this definition perfectly since it can be calculated as 2 multiplied by 2 (2 × 2 = 4), making it the square of the integer 2.

The other numbers listed—2, 3, and 5—cannot be expressed as the square of any integer. They do not result from multiplying an integer by itself. Thus, 4 is the only number among the choices that qualifies as a perfect square, confirming that it is the correct answer.