Get yourself something like this (doesnt have to be this brand, I have a couple of these I picked up from the local home improvement store):
https://www.amazon.com/Sperry-Instr...ster&qid=1575256394&smid=ATVPDKIKX0DER&sr=8-4
The lights will be on, when you plug it into a working outlet (the 2 right lights on the one I have, didnt check which lights on this one on amazon).
Then, you can turn off the breaker you think is for the outlet in question, and see if it goes off. Repeat till it goes off. Then, plug into other outlets around that one and see if they are on.
There is a better way but it costs a bit more money.
Because breakers are usually not labelled with everything they are connected to, and I wanted to know what outlet(s) were powered by what breaker when I bought my house for simple electrical work, I bought a tool that allows you to see what circuit something is on. Something like this, although mine is a bit different:
https://www.amazon.com/Klein-Tools-ET300-Electrical-Standard/dp/B003LHJSY8/ref=sr_1_4?crid=H1WV2KDAWX3D&keywords=klein+tools+circuit+breaker+finder&qid=1575256690&sprefix=klein+tools+circu,aps,180&sr=8-4
You plug in the trasmitter into the outlet, then go to the breaker, turn on the receiver, and slide it down your breakers until it makes a noise to identify the breaker the trasmitter is plugged into. Like I said I have a different klein tools one and others make them as well. I then took a label maker and labeled almost everything in my panel with exactly what rooms were on which breaker. Took a couple hours when the house was new but was worth it.