The following instruction from https://github.com/rh-messaging/amq7-documentation-contrib/blob/contrib/docs/topics/router_installation.adoc does not make sense.

To test that installation was successful, check for the presence of the qdrouterd executable.

$ which qdrouterd
/usr/sbin/qdrouterd
$

The qdrouterd executable should be located at /usr/sbin/qdrouterd. If a different location is indicated, consider modifying your PATH variable.

which searches in PATH. Therefore it is impossible to find qdrouterd using which if it was not on PATH in the first place.