The prime numbers from 1 to 18 are 2, 3, 5, 7, 11, 13, and 17.
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2 x 59
All prime numbers are rational.
There is no need to do prime factorization as prime numbers are already prime.
All prime numbers are not odd numbers. 2 is an even prime number, and it is the only even prime number because all other even numbers have 2 as one of their factors.
It is impossible to list the infinite number of prime numbers and composite numbers.