There is only 1 pair of primes and they are 2*5.
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Not really. You just have to try different numbers. As to patterns, the probability of finding a prime goes down for higher numbers. The number of prime numbers up to a number "n" is roughly equal to n / ln(n), where ln() is the natural logarithm function.
Nothing goes into 1 but itself, it is not a prime number, 2,3,5,7,11,13,17..... are prime numbers. 2 is the only even number that is prime.
54 is divisible by 2 and 3 which are prime numbers
nothing they are both prime numbers
1. The numbers are co-prime.