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
78
the Netherlands
23
France
27
Germany
477
Poland
5355
Switzerland
44
Australia
28
Pakistan
15
the United States
124
India
135
Republic of Ireland
16
the United Kingdom
101
Ghana
10
Nigeria
11