public class PrimeChecker { public static boolean isPrime(int num) { if (num <= 1) { return false; } for (int i = 2; i <= Math.sqrt(num); i++) { if (num % i == 0) { return false; } } return true; } public static void main(String[] args) { int number = 17; // Replace with the number to be checked if (isPrime(number)) { System.out.println(number + " is a prime number."); } else { System.out.println(number + " is not a prime number."); } }
}

import java.util.Scanner;
class main {	public static void main(String [] args) {	Scanner kb = new Scanner(System.in);	System.out.print("? ");	int num1 = kb.nextInt(); boolean res = isprime(num1); System.out.println(res);	}	public static boolean isprime(int num1) { boolean ans = true; int i = 1; for(i = 2;i < num1;i++) { if((num1 % i == 0) && (num1 != 2)) { ans = false; break; }else{ ans = true; break; } } return ans;	}
}