1 is neither prime nor composite because there is only one set of multiples to receive 1, as opposed to 2 which is prime because there are two sets of multiples to receive 2, 2 X 1 and 1 X 2. To be prime there can only be two sets of multiples to receive the number, and for composite there has to be more than two.
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A prime number has no factors except itself and 1.
It is a prime number because its only factors are 1 and itself.
A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite. 71 is prime.
The number 1 is neither composite nor prime.
A prime number can only be divided by itself and by 1 and still result in a whole number but 4 can also be divided by 2.