An even and an odd integer are multiplied together. Which of the following numbers could not be the square of their product?
Select:
A) 484 B) 676 C) 729 D) 900 E) 1600
729 = 3^6 so it can not be the square of an even number multiplied by an odd number.   The answer is 729.
<result>C</result>
An even and an odd integer are multiplied together. Which of the following numbers could not be the square of their product?