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RolfAndreassen comments on "What Is Wrong With Our Thoughts" - Less Wrong
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Again, it does seem observable that nobody has explained why three is prime and four isn't. (I'm not sure you can actually use 'why' in an intelligible way here; possibly I'm being confused by non-mathematical language applied to math.) It's not an observation I would expect anyone to care about, and possibly it may be the equivalent of nobody having seen something invisible; but it does seem to make a statement that could in principle have gone the other way.
I agree that I'm not sure how you're intending to use 'why' here, and I'm pretty sure there's a good answer for any particular meaning.
To answer the question in a possibly unsatisfactory way, 3 is prime because it is a natural number which has exactly two distinct natural number factors, whereas 4 is not prime because it has more than two distinct natural number factors.