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PrimeNumber.java

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import java.util.Scanner;

import java.util.Scanner;

public class PrimeExample3 {

public static void main(String[] args) {

Scanner s = new Scanner(System.in);

System.out.print("Enter a number : ");

int n = s.nextInt();

if (isPrime(n)) {

System.out.println(n + " is a prime number");

} else {

System.out.println(n + " is not a prime number");

}

}

public static boolean isPrime(int n) {

if (n <= 1) {

return false;

}

for (int i = 2; i < Math.sqrt(n); i++) {

if (n % i == 0) {

return false;

}

}

return true;

}

}