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!!
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59 is the first prime number after 55.
67 is the greatest prime number between 55 and 70
The Prime Factors are: 5 x 11
53
It is 55 because it has more than 2 factors