Is it ok to say ではあります instead of です?

Well I am very new to the language. Some things confused me a lot. Like when I saw that the antonym of です is ではありません I wondered why is it so long. On digging a bit more and asking few people, I came to know です is more or less a shortened ではあります.

So I just want to know whether Is it ok to say ではあります instead of です while talking to a Japanese or someone who understands Japanese or will it sound awkward.

Also, please let me know if context has a role here as well!.

Thank you