How do i go about seeing how many prims I have in my skybox?

[PheeSabia]

I have a sky box and I tend to prefer lots of space, I don cramped quarters. I love to decor often but get confused on how to check as a whole, how many prims i have left or how many I have used. I rent from a place so I dont own the sim or anything. I get tired of having to ask oen of the managers how many I have, is there a way I can see for myself how many prims I have in my skybox? It would be so nice if I could. 

[valerie Inshan]

At the top of your screen, go the about land menu: your prim usage appears in the objects tab.

[Rolig Loon]

You can also use your camera view to zoom out just far enough to see your entire skybox.  Then open your Build/Edit tool (CTRL + 3) and drag a selected rectangle around it.  You'll see your prim count and Land Impact score in the Edit window.