What is the possible greatest prime number known?

Answer 1

.

Answer 2

I cringed when I saw multiple responses of "infinity". Infinity is not a prime number; this follows from the fact that infinity is NOT A NUMBER.

Those who say there is no greatest prime are absolutely right. The proof of that is about 3 lines long. It's a rather well-known proof; if you want to see it, ask about it in a different question.

The number posted above by Leo is the largest currently-known prime. "They" (the people who work on that sort of thing; not my kind of math at all) tend to discover a new larger prime every year or two, so don't be surprised if we get a new record sometime in 2007.

Answer 3

There is no greatest prime number because the series is infinite.
that is it is always possible to find a prime number larger than a given prime

Answer 4

it has been proven that the set of primes is infinite. this does not mean that the largest prime is infinity, infinity is in no sense a number, and cannot be prime. however, fi you find the 'largest prime' there will always be another one larger than it

Answer 5

The largest known prime, as of September 2006, is 2^32,582,657 − 1 (this number is 9,808,358 digits long); it is the 44th known Mersenne prime.

Answer 6

Well the number line doesnt end....so there wouldnt be one unless you set a limit

Answer 7

It is too complicated. You better ask your teacher. (the largest no. is infinity!)

Answer 8

Its infinity only.

Answer 9

try this web site:
http://primes.utm.edu/largest.html

Answer 10

http://en.wikipedia.org/wiki/Prime_number#Location_of_the_largest_known_prime