Which number is a perfect square?

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Multiple Choice

Which number is a perfect square?

Explanation:
A perfect square is a number that can be written as n times n for some integer n. So 9 is a perfect square because 3 × 3 equals 9. The other numbers don’t fit that pattern: 7 is between 4 (2^2) and 9 (3^2), 13 is between 9 (3^2) and 16 (4^2), and 18 is between 16 (4^2) and 25 (5^2). Since a perfect square must be exactly the square of an integer, 9 is the only one that qualifies.

A perfect square is a number that can be written as n times n for some integer n. So 9 is a perfect square because 3 × 3 equals 9. The other numbers don’t fit that pattern: 7 is between 4 (2^2) and 9 (3^2), 13 is between 9 (3^2) and 16 (4^2), and 18 is between 16 (4^2) and 25 (5^2). Since a perfect square must be exactly the square of an integer, 9 is the only one that qualifies.

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