67 is the greatest Prime number between 55 and 70
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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!!
59 is the first prime number after 55.
The prime numbers between 55 and 70 are 59, 61, and 67. A prime number is a number greater than 1 that can only be divided by 1 and itself without leaving a remainder. In this case, 59, 61, and 67 are the only prime numbers within the given range.
The Prime Factors are: 5 x 11