What is the reward if the next prime number is found?

Answer 1

The reward is personal satisfaction along with bragging rights to whoever finds the next Prime number.

The EFF has offered rewards for prime numbers with more than 100 million decimal digits ($150,000 for 100 million or more, $250,000 for a billion or more). Note that the largest number currently known to be prime has just under 13 million decimal digits. I'm not aware of any financial rewards for finding primes with fewer than 100,000,000 digits.