Trek Calypso as mountain bike?

I just bought a Trek Calypso out of the newspaper from a very nice couple. They were telling me that it was a mountain bike and they have put new tires on it which look like they'll do the job. My only concern is that everything I've seen on the internet labels the calypso as a "cruiser". Is it... show more I just bought a Trek Calypso out of the newspaper from a very nice couple. They were telling me that it was a mountain bike and they have put new tires on it which look like they'll do the job. My only concern is that everything I've seen on the internet labels the calypso as a "cruiser". Is it possible to use it on trails and non/paved areas? This is important as I live in the mountains. Thank you!
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