5 is already prime.
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Themselves because they are all prime numbers.
The prime numbers (factors) of 40 are: 2 and 5
After 5, all prime numbers end with 1, 3, 7 or 9.
All of them are prime numbers
32 is not a prime because 2 is a factor of all even numbers. 95 is not a prime because all numbers greater than 5 that end in a 5 or 0 are composite numbers.