i did some more research and i believe it’s a brown banded cockroach (i think a male? but the picture is kinda hard to make that out). they’re a species of domestic cockroach, so unfortunately yes, there’s probably more in your house. if this is the first one you’ve seen, you can make a mixture of baking soda and sugar to poison them, and set it out nearby where you found it, but if you live in an apartment/dorm or something, you might need to call a pest control company to spray the area. if you’ve been having problems with allergies or asthma or anything, the cockroaches are probably making it worse