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URL: https://dev.to/silambarasan_a_bd1d4d0a29/prime-number-2kb5

⇱ Prime number - DEV Community

What is prime number?
A number is called a prime number if it has only two factors.

Important Notes
2 is the only even prime number
Numbers less than or equal to 1 are not prime

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JAVA Script:

let num = Number(prompt("Enter a number: "));
let div = 2;
let flag = true;

while (div <= num / 2) {
 if (num % div === 0) {
 flag = false;
 break;
 }
 div++;
}

if (flag === true && num > 1) {
 console.log("This number is Prime");
} else {
 console.log("This number is not Prime");
}

OUTPUT:

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PYTHON:

num=int(input("enter a number: "))
div=2
flag=True
while div<=num/2:
 if num%div==0:
 flag=False
 break
 div+=1
if flag==True:
 print("This number is Prime")
else:
 print("This number is not Prime")

OUTPUT:

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JAVA:

import java.util.Scanner;

public class Main {
 public static void main(String[] args) {

 Scanner sc = new Scanner(System.in);
 System.out.print("Enter a number: ");
 int num = sc.nextInt();

 boolean flag = true;

 if (num <= 1) {
 flag = false;
 } else {
 for (int i = 2; i <= Math.sqrt(num); i++) {
 if (num % i == 0) {
 flag = false;
 break;
 }
 }
 }

 if (flag) {
 System.out.println("This number is Prime");
 } else {
 System.out.println("This number is not Prime");
 }

 sc.close();
 }
}

OUTPUT:

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