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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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5461

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48

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144

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18

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138

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106

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