Answer
not a square screen.
Work Step by Step
Based on the given data, we can find the range in X-direction $\Delta X=X_{max}-X_{min}=6-(-6)=12$, the range in Y-direction $\Delta Y=Y_{max}-Y_{min}=2-(-2)=4$. As $\frac{\Delta X}{\Delta Y}=\frac{12}{4}=\frac{3}{1}$, the viewing rectangle is not a square screen.
