Concept:A perfect square is an integer that can be written as the product of an integer with itself.Explanation:Check each number by finding its square root.2116=46×46, so it is a perfect square.2916=54×54, so it is a perfect square.3136=56×56, so it is a perfect square.3158 cannot be expressed as any integer multiplied by itself. Hence, it is not a perfect square.Answer:Option D: 3158