If a random guy approaches you, is it a sign of interest or just being friendly?

Anonymous
This guy from my class approached me when we were leaving today after our test and he had never talked to me before. He only talked to me about the test, but I was wondering if it is potentially a sign of interest? Are there any ways to know if he is interested based on our conversation? Do guys talk to random girls they aren't interested in? I'm clueless...
If a random guy approaches you, is it a sign of interest or just being friendly?
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