Which is lowest prime number?

Answer 1

All numbers that only have one and itself as factors are prime. Therefore, to tell if a number is prime simply find it's factors. If it has more than two factors than it is not a Prime number.

Answer 2

A prime number is any number that can be divided only by 1 and itself. The mathematician Euclid proved that there are an infinite number of primes. All the primes less than 10 are:

2, 3, 5, and 7. None of these numbers can be divided by any other number other than 1 and itself.

Answer 3

There is no square number that is prime. Prime numbers have no factors other than themselves and 1. (1 is defined to be not-prime) Proof: Suppose that there exists a square number A that is prime. Then A cannot be written as a product of any integers but itself and 1. But A is a square number. That means that there exists some integer n, such that A = n² Hence we are able to write A as A = n*n This is a contradiction since we assumed A was only able to be written as a product of itself and 1. Hence our assumption is false. Therefore, there exists no square number that is prime.

Answer 4

All numbers that only have one and itself as factors are prime. Therefore, to tell if a number is prime simply find it's factors. If it has more than two factors than it is not a prime number.

Answer 5

Prime numbers have two factors: 1 and the number itself.

Composite numbers have more factors than 1 and the number itself, so composite numbers have 3 or more factors.

For example,

The factors of 17 are 1 and 17. It is prime.

The factors of 4 are 1, 2, and 4. It is composite.

Answer 6

That is easy. Almost everyone knows that. It is 2.

Answer 7

The only prime number that is even is the number two.

Answer 8

2

Do not answer 1, because 1 is either prime nor composite.

Answer 9

The lowest prime number is 2. Although 1 is also a prime, it's considered to be a 'special' number.

Answer 10

The one with more than two factors.