JavaScript – Prime Number

CODEPEN

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Github: https://github.com/furkangulsen98/HTML-CSS-JAVASCRIPT/tree/master/JavaScript%20prime%20number

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HTML CODE:

  <div id="container">
        <h2>prime number?</h2>
        <input type="number" id="num" />
        <button onclick="control()">CONTROL</button><br />
        <div id="result"></div>
    </div>

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CSS CODE:

        body, html {
            padding: 0;
            margin: 20px;
            background: #333;
            color: #e53f3f;
            font-family: Verdana;
            display: flex;
            height: 100vh;
            justify-content: center;
            align-items: center;
        }
        #container{
            width: 250px;
        }
        input {
            border: none;
            border-radius: 20px 0px 0px 20px;
            padding: 7px;
            padding-left: 20px;
            width: 100px;
            outline: none;
        }
        button {
            float: right;
            width: 120px;
            padding: 7px;
            border: none;
            border-radius: 0px 20px 20px 0px;
            background: #e53f3f;
            outline: none;
            cursor: pointer;
            color: #fff;
            font-family: Arial;
            font-weight: bold;
            transition: .5s;
        }
        button:hover{
            background: #cf274c;
        }
        #result{
            margin-top: 20px;
            width: 200px;
            text-align:center;
            margin-left: 30px;
            font-size: 20px;
            color: #fff;
            font-family: Verdana;
        }
        h2{
            text-transform: uppercase;
            margin-left: 16px;
        }

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JS CODE:

 function control() {
            let num = document.getElementById("num").value,
                res = document.getElementById("result");
            var cntrl = 0;
            for (var i = 2; i < num; i++) {
                if (num % i == 0) {
                    cntrl++;
                }
            }
            if (cntrl == 0) {
                res.innerHTML = ("prime number")
            }
            else {
                res.innerHTML = ("not prime number")
            }
        }