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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Cube — cbrt path</title>
</head>
<body>
  <h1>Perfect cube (cbrt path)</h1>
  <p>Edit <code>inputNumber</code>, then click <strong>Run</strong>.</p>
  <pre id="out"></pre>
  <script>
    (function () {
      function isCube(number) {
        var k = Math.round(Math.cbrt(Math.abs(number)));
        if (number < 0) {
          k = -k;
        }
        return BigInt(k) ** 3n === BigInt(number);
      }
      var inputNumber = 27;
      var msg = isCube(inputNumber)
        ? inputNumber + " is a cube number."
        : inputNumber + " is not a cube number.";
      document.getElementById("out").textContent = msg;
    })();
  </script>
</body>
</html>

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JavaScript Cube Number — Math.cbrt + BigInt check (Try It)