SOLUTION: Which set of numbers is not closed under multiplication? odd integers, even integers, prime numbers, or rational numbers.

Algebra ->  Real-numbers -> SOLUTION: Which set of numbers is not closed under multiplication? odd integers, even integers, prime numbers, or rational numbers.      Log On


   

Question 257495: Which set of numbers is not closed under multiplication? odd integers, even integers, prime numbers, or rational numbers.
Answer by drk(1908) About Me  (Show Source):
You can put this solution on YOUR website!
Primes are not closed under multiplication.
--
Look at each separately:
odd integers: odd x odd = odd [closed]
even integers: even x even = even [closed]
prime numbers: prime x prime = composite [NOT closed]
rational numbers: fraction x fraction = fraction [closed]