How many prime numbers are there?
less than googol
more than googol, but less the Graham's number
145443097811127
infinitely
The prime number is a natural number that can be divided, without a remainder, only by itself and by 1. For example, 5 can be divided only by 5 and by 1. There are infinitely many primes, as demonstrated by Euclid around 300 BC. The picture above shows the Ulam spiral, which is a graphical depiction of the set of prime numbers.
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Answers by country
less than googol
more than googol, but less the Graham's number
145443097811127
infinitely
answers

10

13

18

80

23

494

27

5422

47

28

15

133

18

138

104

12

11