to check if package is installed to sth like:

dpkg -l | grep bcm


but you've already answered your question - you're installing a source deb package. It's in source because license probably prohibits it from being distributed in binary form..

There is a way to build a binary package from it but I can't think of it now..

try:

dpkg -b <package name>

or..

apt-get --build install <package name>