There's no feasible way of
really knowing but I don't think so. If this
is a simulation something has to be real. There has to be a real reality for something to be simulated. For example, characters in a book have been generated by us to create a story. The story is not real but it is based on concepts that are real and a real person even if they made up the story.
I used to wonder when I was little, what if I were really just one of the characters of a book? What If I was the main character of a book and I lived my whole life thinking I was real but I was really just in a story?
(I wonder how many times I just used the word real

)