No its not. but you need a lot of money :)
Depends on the type of business you want to do; to the best of my knowledge there's no country its a bed of roses for foreigners to do business.
However, if your business is duely registered and you're not into all those kinds of illegal businesses, you can do your business without any interferance.
Note there're taxes to be paid, offices to be rented, staff to be paid utility, transportation etc to be taken care of.
if you need more details on doing SME here send me a pm.. will tell you other ways.