Installing composer in godaddy shared hosting

I have Laravel 5.1 up and running in my shared hosting in GoDaddy. In the installation I have composer.json and composer.lock does it means composer is already installed? Also, if I try to get the composer version typing composer -V in my ssh, I get -bash: composer: command not found. Also, if I do need to install composer do I need to install it in the root or in public_html. Thanks.

via Chebli Mohamed