class prime { public static void main(String...s) { int n,i; System.out.println("Enter the Number:"); n=Integer.parseInt(s[0]); for(i=2; i < n; ++i) { if(n%i==0) break; } if(i==n) System.out.println("Number is prime"); else System.out.println("Number is not prime"); } }
Enter the Number:5 Number is prime
A number is prime if it is divisible by 1 or itself. For example 2, 3, 5, etc are prime numbers while 4, 6, 8, etc are not prime.