apache installed or not

How to check out apache is installed in unix box ?

i don't have execute for httpd -v command and also i don't have 'apache' directory under /usr/local but i could able to see many httpd processes running on the server.

This should help figuring out where these httpd are located:

pfiles $(pgrep httpd) | grep / | sort -u

Good hint :b:
Optionally : cat /var/sadm/install/contents | egrep -i apache