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
Belgium
10
Greece
13
Canada
18
Austria
79
the Netherlands
23
Germany
488
France
27
Poland
5386
Switzerland
45
Australia
28
Pakistan
15
the United States
129
Republic of Ireland
18
India
136
the United Kingdom
103
Ghana
12
Nigeria
11