-- It ends in a 5, so 5 is a factor of it.
-- The sum of its digits (15) is divisible by 3, so 3 is a factor of it.
It probably has tons of other factors, but either of these is enough
to prove that it's composite.
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No, because a prime number that has only two factors, 1(which is niether prime nor composite) and itself(prime).
The number 1 is neither prime nor composite.
They are: 12343+2 = 12345
neither prime or composite
It is prime