Is the number 1 a prime or composite?

Answer 1

The concept of prime or composite is defined only for integers greater than 1.

An alternative argument that is that a 1 has only 1 factor, which is 1. Primes have exactly 2, and composites more than 2. So 1 is neither prime nor composite.

This ensures that the unique prime factorisation theorem (the fundamental theorem of arithmetic) is true.

Answer 2

1 is not a Prime number many people consider it to be one but to be a prime number it must only be divisible by 1 and itself. 1 is only divisible by one and nothing else. the number 1 is also not a composite. Composite numbers are divisible by 1, itself and another number which one is not. Instead it falls under a category called a unit

Answer 3

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.

Answer 4

1 is neither prime nor composite

Answer 5

It is neither. Its only factor is itself.

Answer 6

neither

Answer 7

Neither.