# Prime Number Checker in Java Using BlueJ

Sep 14, 2021

What are Prime Numbers?

In math, prime numbers are whole numbers greater than 1, that have only two factors – 1 and the number itself.

Prime numbers are divisible only by the number 1 or itself.

For example, 2, 3, 5, 7 and 11 are the first few prime numbers.

Reference

https://www.splashlearn.com/math-vocabulary/algebra/prime-number

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Program Listing

``````// Prime_Number.java
// Bacolod City, Negros Occidental Philippines

import java.util.Scanner;

public class Prime_Number {

public static void main(String[] args) {

Scanner scan = new Scanner(System.in);

System.out.println();
System.out.print("\tPrime Number Checker in Java Using BlueJ ");
System.out.println("\n");
System.out.print("\tEnter a Number : ");
int num = scan.nextInt();

boolean flag = false;
for(int i = 2; i <= num/2; ++i)
{
if(num % i == 0)
{
flag = true;
break;
}
}

System.out.println("\n");

if (!flag)
System.out.println("\t" + num + " is a prime number.");
else
System.out.println("\t" + num + " is not a prime number.");
}
}

``````