Some odd numbers can be written as the sum of prime numbers. 2 + 3 = 5
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While all prime numbers are odd (except 2), not all odd numbers are prime. 9 for example is an odd number, but you can get it by multiplying 3X3, so it is not prime. Odd numbers are numbers that are not divisible by 2. Prime numbers are numbers that cannot be generated by multiplying 2 whole numbers besides 1 and itself.
The only even prime is 2. The rest are all multiples of 2, and thus cannot be prime.
Because many of them are divisible by smaller odd numbers. For example 35 is divisible by 5 and so 35 cannot be a prime number.
odd numbers
Some are, but some have more than two factors and cannot be.