25 and 12 are both composite numbers because they have other factors than 1 and themselves.
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17 is a prime number. 8 and 12 are not prime numbers.
2 and 3 are prime numbers that are factors of 12. There is an infinite list of prime numbers that aren't.
4 and 25 are not prime numbers.
'25' is odd, all right, but not prime. (It can be divided by 1, 5, and 25) By the way, prime numbers must be odd numbers. All even numbers can be divided by 2, at least, and are therefore not prime.
25 percent of the numbers from 1 to 100 are prime numbers.