Unfortunately, the rabbit is eaten by most predators. It’s both bird-of-prey from above, ferrets from tunnels below as well as other ground based predators.
So rabbits are social animals and it’s recommended they have at least one buddy. They might survive alone but research shows they are better off with at least one buddy.
However, they don’t always get along with other rabbits, especially when forced to be in small, limited spaces. So it’s recommended they can withdraw to a place, alone, to avoid larger conflicts.