Every Prime number has exactly 2 factors, 1 and the number itself.
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Every positive composite number only has one unique prime factorization.
Look up a list of prime numbers (a Google search for "prime numbers" or "list of prime numbers" should do); every number (greater than 1) that is NOT a prime number is composite.
Oh, what a happy little question! Well, there is only one even prime number, and that's number 2. Even though most prime numbers are odd, 2 is a special one because it's the only even prime number. Just like every color has its place on the canvas, every number has its unique role in mathematics.
No, there are many odd numbers that are not prime: 9, 15, 21, 25, 27, etc. However, 2 is the only even number that is prime, since all other even numbers are divisible by 2.
There are 8. Also, by definition factors must be whole numbers because otherwise every non-zero number is a factor of every number (including prime numbers).