1 is not a prime number
Bt definition any number greater than 1 that has 1 and itself as its factors(positive divisors) is called a prime numbers
Prime numbers are
2,3,5,7,11 etc...
Also keep in mind that 2 is the only even prime(this fact come in handy in some problems)
One silly question about prime numbers
This topic has expert replies
Source: Beat The GMAT — Problem Solving |












