Answer

We don’t know. Unless you believe His words in the Bible: “Is anything too wondrous for the Lord?” “God is not a man, that He should lie.”
Philosophically, it may depend on the question of how you arrive at belief in God. It is possible that the argument leads to His perfection (as, for example, in Anselm’s ontological argument). Omnipotence is hard to reach philosophically, although there is a line of reasoning that the first link in the chain of existence would not have some large but limited power X, but rather infinite power (than which there is none greater). If it has some finite power, then there is room to wonder about the source of that power itself. But this is not a decisive argument.