# How do I check if a number is a prime number in JavaScript?Rashid D

To check if a number is a prime number in JavaScript, you can use a loop to test if it is divisible by any number other than 1 and itself. Here's a step-by-step guide on how to achieve this:
**1. Define the number you want to check:**

`1 2 3`

`const number = 13;`

Replace`13`

with the actual number you want to check.
**2. Implement the prime number checking logic:**

`1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20`

`function isPrime(number) { // Check if number is less than 2 if (number < 2) { return false; } // Loop through numbers from 2 to the square root of the number for (let i = 2; i <= Math.sqrt(number); i++) { if (number % i === 0) { return false; // Number is divisible by another number, not prime } } return true; // Number is prime } const isPrimeNumber = isPrime(number); console.log(isPrimeNumber);`

In this example, the`isPrime()`

function takes the`number`

as an argument. It first checks if the number is less than 2, as prime numbers must be greater than or equal to 2. Then, it loops through numbers from 2 up to the square root of the number. If the number is divisible by any of these numbers, it is not a prime number and`false`

is returned. If the loop completes without finding any divisors, the number is considered prime and`true`

is returned.
**3. Display the result:**
Use the result of the prime number check to inform the user whether the number is prime or not.

`1 2 3`

`console.log(`${number} is ${isPrimeNumber ? 'prime' : 'not prime'}`);`

This example logs a message indicating whether the number is prime or not to the console. By following these steps, you can check if a number is a prime number in JavaScript. Adjust the code as needed to fit your specific use case and handle different numbers.

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