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import java.io.*; 
public class Prime 
{
public static void main(String arg[]) 
{
int number; 
String numberS; 
number = 0; 
try 
{ 
DataInputStream in; 
in = new DataInputStream(System.in); 
System.out.println("Please Enter a Number"); System.out.flush(); 
numberS = in.readLine(); 
number = Integer.parseInt(numberS); 
}
catch(IOException e)
{
System.out.println("Input Output error"); System.exit(1);
}
for(int i = 2; i < number; i++)
{
if (number % i == 0)
{
System.out.println(number + " is NOT PRIME. "); System.exit(0);
}
}
System.out.println(number + " is PRIME. " ); 
}
}

Output :  
           Please Enter a Number 
           7
           7 is PRIME.
           Please Enter a Number 
           6
           6 is NOT PRIME