PRIME, HCF, LCM - SIEVE

INTRODUCTION
Search the definition of the following using reliable websites (post as comments and remember to quote the sites in your comments)
1. PRIME NUMBER
2. COMPOSITE NUMBER

Question:
3. Are all odd numbers prime? Justify
4. Are all even numbers composite numbers? Justify

SIEVE OF ERASTOTHENES
View the following video before completing the exercise in the booklet.
Exercise Respect and Responsibility while watching