$20 party SNG push or fold?

[NotAClue]

Sorry if this question (or something similar) has been answered before:

Down to the money, I'm in the SB with about 1800, Button has about the same (but has me covered) and BB has the rest of the chips. 200/400 blinds.

Button raises to 1000, this means he does not have a monster hand, likely two highcards or a medium pocket pair. I have 99, is this a push? Button will not fold if I push.