No, for example you can't create the number 65, which is not a Prime number, by adding any two prime numbers.
39 is not a prime number because it has four factors: 1,3,13,39 and because prime number are numbers who has 2 factors.
a prime number is a number that can only be divided by 1and its self... 1 isnt a prime number but 2, 3, 5, 7, 9, 11 etc... are prime numbers.
23, 37, 79 and 51 (assuming 1851 is a typo, 18 isnt a prime) if not a typo 1851 isnt a prime number anyway, it divides by 3
because this number is not divisible by 2
62 is not a prime number and you cannot get a relitavely prime number it either is a prime number or it isnt a prime number! The definition of a prime number is a number that can only be divided b itself and one. No other number 62 can be divided by 2 as well as itself and 1 so NO IT IS NOT A PRIME NUMBER even numbers tend not to be prime numbers because they can be divided by two the only even number that is prime is 2 because it can only be divided by itself and 1 I hope this helped!
9 times 11 is 99. A prime is a number whose factors are one and itself.
no, 5 isnt divisable by 19. 19 is a prime number and isnt divisable by anything.
nine (though sometimes 2 isnt counted 1,2,3,5,7,11,13,17,19
prime because 4.5 yards equals 13 feet and 13 is prime because theres no number you can multiply to get 13 that isnt 1 and itself