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import java.util.Scanner; class PrimeCheck {public static void main(String args[]){int temp;boolean isPrime=true;Scanner scan= new Scanner(System.in);System.out.println("Enter a number for check:");//capture the input in an integerint num=scan.nextInt();for(int i=2;i<=num/2;i++){ temp=num%i;if(temp==0){ isPrime=false;break;}}//If isPrime is true then the number is prime else notif(isPrime)System.out.println(num + " is Prime Number");elseSystem.out.println(num + " is not Prime Number");} }

This program will prompt user to enter a number and then it will check and display whether the input number is prime or not.
import java.util.Scanner; class PrimeCheck {public static void main(String args[]){int temp;boolean isPrime=true;Scanner scan= new Scanner(System.in);System.out.println("Enter a number for check:");//capture the input in an integerint num=scan.nextInt();for(int i=2;i<=num/2;i++){ temp=num%i;if(temp==0){ isPrime=false;break;}}//If isPrime is true then the number is prime else notif(isPrime)System.out.println(num + " is Prime Number");elseSystem.out.println(num + " is not Prime Number");} }Output:
Enter a number for check: 19 19 is Prime NumberOutput 2:
Enter a number for check: 6 6 is not Prime Number