To find out which version of Apache you’re running on a *nix system, you can run the following command. This will only work if you have permission to run the script in the first place, so you should probably login as root or use sudo, if you can. If this isn’t possible, then you should probably just contact your hosting provider or just look around in your hosting control panel.
steve$ httpd -v
# or use this
steve$ httpd -V
# or use this
steve$ httpd -V