Prime Number

A prime number is a whole number greater than 1 whose only factors are 1 and itself. A factor is a whole numbers that can be divided evenly into another number. The first few prime numbers are 2, 3, 5, 7, 11, 13, 17, 19, 23 and 29. Numbersthat have more than two factors are called composite numbers.
int n = 15, f=0;

for (int i = 2; i < n; i++)
{
                if (n % i == 0)
                    f = 1;
}

            if (f == 0)
            {
                System.out.println( "Given Number is Prime Number");
            }else{
                System.out.println( "Given Number is Not Prime Number");
            }