Prime number in Java: Prime number is a number that is greater than 1 and divided by 1 or itself only. In other words, prime numbers can't be divided by other numbers than itself or 1. For example 2, 3, 5, 7, 11, 13, 17.... are the prime numbers.
import java.util.Scanner;
class prime
{//class prime opens
public static void main(String[]args)
{//main method opens
Scanner sc=new Scanner(System.in);
System.out.println("Enter a no");
int n=sc.nextInt();//variable n to accept the no
int c=0;//variable c to count the no of factors
for(int i=1;i<=n;i++)
{
if(n%i==0)
c=c+1;
}
if(c%2==0)
System.out.println("It is a prime no");
else
System.out.println("It is not a prime no");
}//main method closes
}//class closes
