Your Apache is probably just fine but it looks like it's not started
.Hence, that's why it's not "listening". There's a couple ways to start the service.
1. Be user root and type "/usr/sbin/httpd start"
2. /etc/init.d/httpd start
However, it also could be that you didn't install apache. Check this to see if you do have the apache package:
rpm -q apache