What does "sixty-four thousand dollar question" mean?

Answer 1

It comes from a US TV quizz show of the same name, broadcast in the 1950's.

Contestants were asked ever more difficult questions, with prize money doubling every time until the "top" $64 000 question

Nowadays it means "the big question", "the main question", "the one we need to answer most", "the question that goes to the heart of the matter"

Answer 2

Reference to old tv quiz show. Means the really important question that needs to be answered.

Answer 3

there was a TV quiz show in the 60s and the final question was worth $64,000.00

Answer 4

a phrase describing a really big question. i think . tehe