Almost all rpm package has i386 or x86_64 added to RPM file extension. However some times you may see file name such as file-version.rpm. You can list all installed rpm packages with rpm -qa command but it will not display architecture. You can run following command to display rpm package architecture:
rpm -qa --qf "%{n}-%{arch}\n"
output as below
dbus-glib-x86_64
nss-i386
dbus-glib-i386
gnutls-i386
libxml2-i386