BoxCollider not blocking other object(s)

I'm really newbie , watched about 20 videos about and tried to do something. But I still have problems with collisions.

I'm working on 2D. I have a Sprite and a Cube. When I click to somewhere at screen, sprite is moving to that position. When sprite hit to cube, it should stop moving (when collision occured) , but instead it's passing through it.

Sprite has these components:

Cube has this components:

BallControl Script

 using UnityEngine;
 using System.Collections;
 
 public class BallControl : MonoBehaviour {
     
     private Transform tf;
     private Rigidbody2D rb;
     Vector3 mousePosition;
     void Start()
     {
         tf = GetComponent<Transform> ();
         rb = GetComponent<Rigidbody2D> ();
     }
     
     void Update ()
     {
 
         if (Input.GetMouseButtonDown (0)) {
             mousePosition = Camera.main.ScreenToWorldPoint(Input.mousePosition);
             mousePosition.z = 0f; // Because we are working on 2D
 
             }
         transform.position = Vector3.MoveTowards(transform.position, mousePosition, 1.5f * Time.deltaTime);
     }
 }

Can you tell me why cube's Box Collider not blocking sprite? Should i add something like this to my BallControl script?

 void OnCollisionEnter(...)
 {
      // Stop moving
 }