Swedish is one of the official languages in Finland, it is a Swedish speaking country.
Officially and practically are two different things. I'd rather say that in practice Finland is, at most, a Swedish-understanding country. Less than 5,5% of Finns are native Swedish-speakers, and they are concentrated in some parts of the coastal areas. Most of the interior, the north and the east lacks even small concentrations of Swedish-speakers. Thus, while all Finns learn some Swedish in school, practically the great majority (especially outside those coastal areas) will not use the language in their daily lives - and then will in some years de-learn most of their school lessons in Swedish. At a guess, I'd be surprised if more than 15% of the native Finnish-speakers are practically capable of anything more than greetings and short, stilted Swedish-language conversations with limited vocabulary. Most will understand Swedish words to some extent, even in the interior, but the great majority will attempt to rather use Finnish (with a native Swedish-speaker) or English (with a Swedish national) to communicate.