Question

A prime number is an integer greater than 1 that is evenly divisible by only 1 and itself. For example, 2, 3, 5, and 7 are prime numbers, but 4, 6, 8, and 9 are not. Create a PrimeNumber application that prompts the user for a number and then displays a message indicating whether the number is prime or not. Hint: The % operator can be used to determine if one number is evenly divisible by another. ( Java programing )

Answer 1

//PrimeNumberCheck.java
import java.util.Scanner;
public class PrimeNumberCheck {
    private static boolean isPrime(int n) {
        if(n%2!=0 && n%3!=0){
            return true;
        }
        else{
            return false;
        }
    }

    public static void main(String args[]) {
        int n;
        Scanner scanner = new Scanner(System.in);
        System.out.print("Enter a number: ");
        n = scanner.nextInt();
        if(isPrime(n)){
            System.out.println(n+" is a prime");
        }
        else{
            System.out.println(n+" is a not prime");
        }
    }
}