Yes. The very nature of the story in Frankenstein, where a scientist creates a living being through his own scientific knowledge and methods, is quintessentially science fiction. It also explored themes like the role of the creator, the monstrosity of the created, and the ethical questions surrounding scientific progress. These are all common themes in science fiction today, and Frankenstein was the pioneer in this regard.
Yes, it is. The novel features Dr. Frankenstein's scientific experiment to create life, which is a very science - fictional concept. It also delved into the implications of this creation on society and the individual. No other work before it had combined such scientific ideas with a fictional narrative in the same way, so it's considered the first of its kind.