because it isn't divisible by number
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Themselves because they are all prime numbers.
2, 3, 5 are prime numbers but 9 is not a prime number
2 3 5 are prime numbers.
The prime factors are: 2 3 5
75 is not a prime number as it is divisible by 3 and 5. Prime numbers are numbers that are only divisible by 1 and themselves.