disregardthat
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dimension10 said:But the definition of a prime number, is that, it has only 2 factors. 2 has 2 factors and is thus a prime numbers.
I have provided a sound argument as compared to yours, that "0 is not a number because it does not share a certain property with all other rationals". Believe me, every rational has some property not shared with all other rationals.
2 does similarly not share a property with all other primes, but this provides no basis for denying that 2 is a prime number.
What I'm most interested in is what you consider "a number" is. It is essentially a conventional label (which leaves it up to personal, or more correctly, collective opinion), and no argument could prove that 0 is not a number. This applies to the primes as well. The definition "a natural number which is divisible only by 1 and itself is a prime" corresponds to "an element of Q is a number". We don't leave out 2 as a prime by the same type of reason we don't leave out 0 as a number.
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