I’m trying to find out whether there is more than one page of posts (I’ve set my posts per blog page to 5 in the reading settings) in a custom category template.
I would think the global query would have the total number of pages as a property but I can’t find the call to it.
global $wp_query;
echo $wp_query->max_num_pages;
This shows the number of pages for the current query. If you want to determine the actual number of posts found by the current query, you may use $wp_query->found_posts
Source:- http://codex.wordpress.org/Class_Reference/WP_Query