Answer: No, there is no dominant strategy for Firm A.
Step-by-step explanation:
Dominant strategies would refer to those that a Firm can take and still have a better payoff regardless of what the other Firm/player chooses. From the above, there is no dominant strategy for Firm A because there is no single strategy that they can follow that will maximise payoff regardless of what B does.
For instance, if Firm A were to charge a lower price, and Firm B charged a higher price, Firm A would make less than Firm B at $2 million. They make less regardless of any decision they make.