To check if the server is Suexec or not? follow the steps as below:
Login into you server with the root details and run following command:
/usr/local/cpanel/bin/rebuild_phpconf --current
If server is Suexec then result would be as follows:
Available handlers: suphp dso cgi none DEFAULT PHP: 5 PHP4 SAPI: none PHP5 SAPI: suphp SUEXEC: enabled RUID2: not installed
Enjoy.