Hacked WP site

In my public_html directory, I found directories named:

-63e3
-d52fa
-ec34
-nlyopmi
-toniyjs

Since I don’t recognize these, I would appreciate if anyone told me if those are some kind of malware or such. I am very new to all this. Also, in users section, I found 3 users that I would like to know if they should be there:

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