>   set rtp+=~/y/plugin/y.vim
> 
> part was a typo

Then: many plugins define a variable g:loaded_PLUGIN_NAME that is used by the 
plugin to make sure the file is sourced only once. You could query that 
variable with exists('g:loaded_PLUGIN_NAME').

Otherwise you can redirect (:h :redir) the output of scriptnames (:h 
:scriptnames) as suggested by ZyX and then match that string against the 
filename of the plugin.

It depends on why you want to check if the plugin was loaded.

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