I don't think you can immediately tell that someone is a prodigy, despite the associations we have with the word. You have to watch and wait for a bit, and allow for some instruction or at least time with the subject. I would look into a different instrument for your child--perhaps piano or violin. Prodigy or not, sounds like he possesses natural musical talent for sure.

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I believe the definition of a prodigy is a child, usually under the age of 10, having the level of ability as an adult.

This seems like a good definition to me. But what kind of adult? I'm terrible at chess and I don't play piano, so lots of kids are prodigies by my standard. wink At the same time, I think you could be a child prodigy and not be at the level of a world-class pianist or chess player at 7.