Question

which is the smallest odd composite number? how many even prime numbers are there? What is it? Are all prime numbers odd? Which is the smallest composite number? Which of the following are not prime numbers? 1,3,9,91,93,57,31,39,43 How many multiples of 9 are there in 200? Does 66 have three prime factors?

Answer 1

Smallest odd composite number = 9
Number of even primes = 1 and the even prime is 2.
No, all prime numbers are not odd.
4 is the smallest composite number.
Non-primes from the list = {9,91,93,39}
Number of multiples of 9 less than 200 = 22
Yes, 66 have three prime factors. they are 2,3,11