Well...
If your "3" can be seen from the ground? then yes. But if you only see it from google earth? then it will be seen from the ground as 3 hills or peaks. If you have a map with a "3" in it and you want to know if it is the right 3 ? then look around for other markers that match up with your map. This is all that i can tell you right now but i hope that it answers your question.