Two
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There are infinitely many prime numbers and the product of any four of them will meet the requirements. For example, 11*37*97*983 = 38,807,857
31 is a prime number. Its only prime factor is 31.
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To determine the number of prime numbers between 1 and 8888888888888888888888888888888888888888888888, we can use the Prime Number Theorem. This theorem states that the density of prime numbers around a large number n is approximately 1/ln(n). Therefore, the number of prime numbers between 1 and 8888888888888888888888888888888888888888888888 can be estimated by dividing ln(8888888888888888888888888888888888888888888888) by ln(2), which gives approximately 1.33 x 10^27 prime numbers.
'2' is the only even prime number. All other even numbers have '2' as a factor.