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<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Automorphic — single n</title>
</head>
<body>
  <h1>Single automorphic check</h1>
  <p>Edit <code>number</code> in the script, then click <strong>Run</strong>.</p>
  <pre id="out"></pre>
  <script>
    (function () {
      function pow10(k) {
        var p = 1;
        for (var i = 0; i < k; i++) p *= 10;
        return p;
      }
      function isAutomorphic(n) {
        if (n <= 0) return false;
        var k = String(n).length;
        return (n * n) % pow10(k) === n;
      }
      var number = 76;
      var msg = isAutomorphic(number)
        ? number + " is an automorphic number."
        : number + " is not an automorphic number.";
      document.getElementById("out").textContent = msg;
    })();
  </script>
</body>
</html>

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JavaScript Automorphic — Single check (Try It)