No, it's directly stated several times. One conversation between the Japanese trade minister and the Japanese army officer asking for the survey of uranium deposits in the neutral zone (hint). The trade minister is pissed when he realizes they intend to use the bomb formula offensively and not just as a deterrent as…

The story happens over an entire season. If you want a episodic tv show, stick to CSI and Law and Order. None of the best shows on TV (the Wire, Game of Thrones, Breaking Bad) are structured where every episode has its own conflict and resolution in the span of 1 hour.

It's essential to the plot. It's the recipe for the atomic bomb meant to create a more even balance of power and thwart a potential attack from the Nazis against the Japanese. Think Julius Rosenberg.