Not displaying blog on new pages

I have created new pages outside of the wordpress application. They need to interact with a different database. I am using a theme called “random image.” I don’t want the blog posts to appear on these new pages. What can I change in the file /wp-content/themes/random-image/header.php so that the blog does not display on these subpages? I made a new version of it, but lost the user info.
-Patty