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Do prime numbers have to be odd and composite numbers have to be even?
No. All prime numbers except for the number 2 are odd. However, most odd numbers are composite numbers. All even numbers greater than 2 are composite numbers. So, prime numbers do not need to be odd, since one prime number is even. Also, composite numbers do not need to be even.Here are some composite odd numbers:9 = 3 x 333 = 3 x 1175 = 5 x 15
Are all composite numbers also even numbers?
No, some composite numbers are odd. The smallest composite odd numbers are 9, 15, 21, 25, and 27. Not all even numbers are composite either. There's only one even number that's prime, which is 2.
What is the difference between the even numbers and composite numbers?
The set of even numbers contains the prime number, 2. The set of composite numbers contains infinitely many odd numbers.
How many counting numbers less than 30 are composite but neither odd nor even?
None. All counting numbers are even or odd.
Does composite numbers have an even number of factors correct or incorrect explain?
Incorrect. Square numbers are composite and have an odd number of factors.
