Larry is right.
When you have a page or post that has a number after it so it reads page1 instead of page that usually denotes that there is a file with that same name in the trash.
You need to look at the files root classification either Pages or Posts in the dashboard menu in this case Pages and then Trash.
You will find a file with the same name already created and living in the trash.
You can delete it from there and then go back to the page you want the number removed from and edit the permalink to reflect the information you want.