Prime number function Js code example

Example: Prime number function Js

// program to check if a number is prime or not
function isPrime(){
    // take input from the user
    const number = parseInt(prompt("Enter a positive number: "));
    let isPrime = true;

    // check if number is equal to 1
    if (number === 1) {
        console.log("1 is neither prime nor composite number.");
    }

    // check if number is greater than 1
    else if (number > 1) {

        // looping through 2 to number-1
        for (let i = 2; i < number; i++) {
            if (number % i == 0) {
                isPrime = false;
                break;
            }
        }

        if (isPrime) {
            console.log(`${number} is a prime number`);
        } else {
            console.log(`${number} is a not prime number`);
        }
    }

    // check if number is less than 1
    else {
        console.log("The number is not a prime number.");
    }
}