Depends on how one defines “rich.” For me, it means someone whose passive income exceeds their spending. A person like that might only have a net worth of a million or two - and they probably had to be pretty disciplined with budgeting to get there. But not only that, they also need to stay good with it to avoid living beyond their means.

EDIT: I actually disagree with my own definition now. What I was describing more accurately fits someone who’s either wealthy or financially secure, whereas rich tends to describe someone with high spending - which, unlike being wealthy, may or may not be sustainable in the long run.