The number is bigger than 5 but ends in 5 so it is divisible by 5. Therefore it cannot be a prime.
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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!!
55 and 72 are relatively prime because they have no prime factors in common.
59 is the first prime number after 55.
The two prime numbers that are factors of 55 are 11 and 5.
55 Divide by 5. 11,5 Stop. All the factors are prime. 5 x 11 = 55