No. You'll need to create a Facebook account to use Messenger. You can then deactivate your Facebook account and log into Messenger using your Facebook ...
I signed up for messenger without Facebook. Later I signed to Facebook too with ... yes to use Facebook you need to have either phone number or Email id.
24.06.2015 · With Messenger, we’ve been focused on creating the best messaging experience possible by giving people a fun and easy way to connect and express themselves with friends and contacts. If you’re in Canada, the United States, Peru or Venezuela, we are starting to roll out a new way for you to sign up for Messenger – without a Facebook account.