Hello Dave GG,
Firstly, welcome to GMAT Club forum. I hope you'll find it a great resource for your preparation.
Secondly, please, DO NOT post an OA along with the question, give a chance to other forum users to try to solve it by themselves first.
Also, please post in either PS or DS section. We are trying to follow this pattern for now.
Lastly, please, DO the research before posting. This question was answered here smallest-prime-factor-76565.html
, by the way, if you really want to dig this one deep, look up Wilson's theorem and modular arithmetic, and try to reason it out.
Thank you! Have fun and enjoy!
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