Whether or not 1 is prime is a question of definitions.
While I admit that it makes more sense to me to say that
1 is not a prime, there is certainly not universal agreement
on it. In particular (as I discovered when I took some
advanced number theory courses) a number of the people who
undertook to compute long lists of primes started their
lists with 1. After a while you learn not to be too
dogmatic about it. (Though I have to say that there is
far more agreement that 1 is not prime than there is on,
say, whether 0 is a natural number.)
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