javaScript_playground/assignment4.html at master · ramanujamgond/javaScript_playground · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Check a number is prime number</title>
</head>
<body>
        <input type="text" id="number">
        <button onclick=checkPrime()>Submit</button>
        <script>
            function checkPrime() {
                let check = document.getElementById("number").value;
                check = parseInt(check);
                let isPrime, value;

                if(check === 2 || check === 3) {
                    isPrime = true
                }

                for(let i = 2; i < check; i++) {
                    isPrime = true;
                    if(check % i === 0) {
                        isPrime = false;
                        value = i;
                        break;
                    }
                }

                if(isPrime === true) {
                    alert(check + " is a prime number!");
                } else {
                    alert(check + " is not a prime number! as it is also a multiple of " + value);
                }
            }
        </script>
</body>
</html>