Can an amplitude of a wave be $\pi$? In the problem I am trying to figure out, the question asks me to find the amplitude of the equation $$y= \pi \sin(5 \pi x).$$ Is the amplitude $\pi$?

The amplitude is indeed $\pi$. The pre-factor of the trigonometric function dictates the amplitude of the function. For example: in the simpler case $$ f(x)=a\sin x$$ the amplitude of $f$ is $a$.