How can I clone many cubes in x y and z axis?

Questions
1

I want to clone the cubes 16 x 16 in x and z, so there is 256 cubes combined in x and z axes, but I also want to clone that 16 x 16 perimeter in multiple places so I dont have to clone one cube tens of 1000s of times. code:

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Cave Game</title>
    <link rel="stylesheet" href="style.css" />
  </head>
  <body>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/r128/three.js"></script>
    <script type="text/javascript">
      const scene = new THREE.Scene();
      const camera = new THREE.PerspectiveCamera(
        75,
        window.innerWidth / window.innerHeight,
        0.1,
        1000
      );
      const renderer = new THREE.WebGLRenderer();
      renderer.setSize(window.innerWidth, window.innerHeight);
      document.body.appendChild(renderer.domElement);

      const texture = new THREE.TextureLoader().load("grass.jpg");
      const geometry = new THREE.BoxGeometry();
      const material = new THREE.MeshBasicMaterial({ map: texture });
      const cube = new THREE.Mesh(geometry, material);
      scene.add(cube);
      for (let i = 1; i < 128; i++) {
        window["cube" + i] = cube.clone();
        window["cube" + i].position.x = i;

        scene.add(window["cube" + i]);
      }
      camera.position.z = 5;
      camera.position.y = 2;

      const animate = function () {
        requestAnimationFrame(animate);
        renderer.render(scene, camera);
      };
      animate();
    </script>
  </body>
</html>