All of the integers >= 1 that have only 2 divisors...1 and the number itself 1 3 5 19 23 83 etc etc (there are lots in between my examples)
A prime is a natural number that has no positive divisors other than 1 and itself
2 is the only even prime
The rest are 3, 5, 7, 11, 13, 17........etc.
Thanx for the correction Chris..... '1' by the definition is not considered a prime number.