5 is a Prime number. The others are not.
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Out of 9, 6, and 5, five is the prime number.
1 can be seen as a unique number or a prime number depending on who you ask. 2, 3, 5 are other prime numbers in this set
1,2,3,5,7,11,13,17,19,23,29,31.... A prime number has exactly two factors. 2 is prime (its factors are 1 and 2) 3 is prime (its factors are 1 and 3) 5 is prime (its factors are 1 and 5) 1 is not prime (its only factor is 1, this is 1 factor, not 2) 4 is not prime (it has 3 factors: 1, 2, and 4) 6 is not prime (it has 4 factors: 1, 2, 3, and 6)
5 is a prime number.
The prime number you can get are 1, 2, 3, and 5. That is 4 out of 6 or 2/3.