A hemiacetal does form briefly in acid catalyzed reactions (it's an intermediate), but like TBR explained, it's not something you can isolate because the forward reaction is very favorable. By the end of the reaction, you'll end up with a solution composed predominately of acetals. With base on the other hand, only hemiacetals can be formed. -OH is not a good leaving group. It would need to leave in order for another alkoxide ion to come in and attack to form an acetal. Just won't happen for base catalyzed reactions. With acid catalyzed reactions, after hemiacetal formation, the -OH is first protonated, forming a good leaving group (H2O). This allows another alcohol to come in and displace water to form the acetal (very favorable).
If they are asking for the major product, which is typically the question they'll ask, then the answer is no, because in this case, the major product (in acid catalyzed rxn) would be an acetal. However, if instead they asked what intermediate is formed, then the answer is hemiacetal. I believe that's the distinction TBR was trying to make, but worded it poorly.
