Here's a few sentences with "furthermore:"

Tom's favorite word is "furthermore."

Mary shouted "furthermore" for no reason.

He looked up "furthermore" in the dictionary.

I can't think of a sentence with the word "furthermore" in it.

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Nevermore would the raven say, "Furthermore".

And furthermore... The farther you go, the further you will get!

'Furthermore' is a transition word which basically means 'in addition'.

A sentence with furthermore: Furthermore, he left orders not to be disturbed. Your welcome for this answer for all those folks who wonder this question. :*

No, "furthermore" is an adverb that is used to add information or ideas in a conversation or text. It is not a preposition.