# prime number program in javascript

• JavaScript prime number program
• In this example will learn about how to find the number is prime or not.
• WHATS IS PRIME NUMBER
• A number greater than 1 with exactly two factors is called prime number.
• Number which is divisible by 1 and itself is prime number. If it is divisible by any other number(other than 1 and itself) then it's not a prime number.
• Consider an example of number 5 ,Which has only two factors  1 and 5. This means 5 is a prime number. Lets take one more example Number 6, which has more than two factors, i.e 1,2,3. This means 6 is not a prime number.
• The first ten prime numbers are 2,3,5,7,11,13,17,19,23,29.
• Note: It should be noted that 1 is non-prime number, because in the above defination already mentioned A number greater than 1 with 2 factors called prime number..

• Here we have simple program to print the prime numbers in java script.
JavaScript program to check a number is prime number or not.

1. <html>
3. <script>
4.     // javascript program to check the number is prime or not.
5.     // prime number program in javascript
6.     // javascript prime number program
7.     // take input from the user
8. const x = parseInt(prompt("Enter a number to check prime or not: "));

10. // check if number is equal to 1
11. if (x  === 1) {
12.     alert("1 is neither prime nor composite number.");
13. }

14. // checking  if  number is greater than one or not

15. else if (x  > 1) {

16.     // iterating from 2 to number -1 (leaving 1 and itself )
17.     for (let i = 2; i < x ; i++) {
18.         if (x  % i == 0) {
19.             isPrimeNumber = false;
20.             break;
21.         }
22.     }

23.     if (isPrimeNumber) {
24.         alert(`\${x } is a prime number`);
25.     } else {
26.         alert(`\${x } is not a prime number`);
27.     }
28. }

29. // check if number is less than 1
30. else {
31.     console.log("The number is not a prime number.");
32. }
33. </script>
35.     <body>

36.     </body>
37. </html>

Output:

#### Instance Of Java

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