It is 55 because it has more than 2 factors
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The prime numbers from 1 - 55 are 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, and 53.
55 is not a prime number because you can do 5*11=55. The definition of a prime number is a number that has only the factors of 1 and itself. Because 55 has 1*55-55 AND 5*11=55 it is not a prime number. Hope that helps!!
17 19 23 29 31 37 41 43 47 53.
59 is the first prime number after 55.
13 17 19 23 29 31 37 41 43 47 53.