Prime Numbers

by Robert Mochel

HTML

<title>Check a number is prime or not</title>
<input type="textbox" id="number" value="" />
<input type="button" id="prime" value="Start" onClick="test_prime()">

<body>

  <p id="output"></p>

JavaScript

function test_prime() {

  if (n === 1) {
    return false;
  } else if (n === 2) {
    return true;
  } else {
    for (var x = 2; x < n; x++) {
      if (n % x === 0) {
        return false;
      }
    }
    return true;
  }
}

function displayGuess() {
  document.getElementById("output").innerHTML = x;
}