Instantiate an array of prefabs, and call a function in each prefab.

So I have an array set up for my prefabs and instantiate them, then after I spawn each prefab I want to call a function with a parameter. However all the prefabs are set to the last function called.

 public GameObject Number;
 int num;
 const int width = 7;
 const int height = 5;

 GameObject[,] newNumber;

 void Start ()
 {
     GameObject[,] newNumber = new GameObject[width, height];
     var rand = new System.Random();
     for (int j = 0; j < height; j++)
     {
         for (int i = 0; i < width; i++)
         {
             Vector2 pos = Camera.main.ScreenToWorldPoint(new Vector2(Screen.width * (0.2f + 0.1f * i), Screen.height * (1 + 0.15f * j)));
             newNumber[i,j] = (GameObject)Instantiate(Number, pos, Quaternion.identity);
             num = rand.Next(1, 6);
             Debug.Log(num);
             newNumber[i,j].GetComponent<Number>().initialize(num);
         }
     }      
 }

Code in prefab:

 public void initialize(int no)
     {
         Debug.Log("initialized");
         currentRenderer = this.GetComponent<SpriteRenderer>();
         if (no == 1)
         {
             currentRenderer.sprite = number1;
             number = 1;
         }
         else if (no == 2)
         {
             currentRenderer.sprite = number2;
             number = 2;
         }
         else if (no == 3)
         {
             currentRenderer.sprite = number4;
             number = 4;
         }
         else if (no == 4)
         {
             currentRenderer.sprite = number6;
             number = 6;
         }
         else if (no == 5)
         {
             currentRenderer.sprite = number8;
             number = 8;
         }
     }