They all have only two factors.
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No. It IS true that every whole number is either prime or composite. But there are numbers that are not whole numbers, such as 2.5, which are neither prime nor composite.
That's not true.
True. Thank you. Now, what's your question ?
Kind of. The only prime number that is even is 2.
Every prime number has exactly 2 factors, 1 and the number itself.