What I did on my old boat is I took a long flat head screwdriver, and held it on the nut in the center of the prop. Then I took a marker put me a black mark further up on the screwdriver. Then I slowly turned the prop with my hand, and If I seen the black mark moving up and down then I knew I had a bent prop shaft. This may not be an official way to tell, but it worked for me. I took the prop shaft to some machine shop on HWY 90 in Sulphur, and they straightened it for me for free. They said they couldn't get it perfectly straight, but they got it very very close. After they straightened it, I did the same test with the screwdriver, and the black mark didn't move anymore.
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