How do you figure out what is that makes a number a prime

Prime numbers are the numbers that are bigger than one and cannot be divided evenly by any other number except 1 and itself. If a number can be divided evenly by any other number not counting itself and 1, it is not prime and is referred to as a composite number. Prime numbers are whole numbers that must be greater than 1. Zero and one are not considered prime numbers. Learn how to determine which numbers are prime.

This was not copied from a website or someone else. This was from my last year report.

A Number Greater Than 1 Is A Prime Number, If It Only Has 2 Factors, Itself &&' 1 . 

18

Step-by-step explanation:

1.5 x 0.25= 6 (for 1 side)

6 x 3= 18 packages.