An even and an odd integer are multiplied together. Which of the following numbers could not be the square of their product?  Choose the correct choice from the following answers:
A) 196
B) 400
C) 441
D) 484
E) 900
441 = 3^2*7^2 so it can not be the square of an even number multiplied by an odd number.   The answer is 441.
<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?