SSH to your server:
root
yourserver [~]# grep -i mod_rewrite /usr/local/apache/conf/httpd.conf
Then you will see this which means it's enabled:
LoadModule rewrite_module libexec/mod_rewrite.so
AddModule mod_rewrite.c
<IfModule mod_rewrite.c>
If you don't see these lines, it's not enabled.
By default, it is.