How can you tell if a number is a composite number?

How can you tell if a number is a composite number? How can you tell that 4 is a composite number? It is greater than 1. You can divide 4 by 4. You can also divide 4 by 2, so it’s divisible by other whole numbers. That means 4 is a composite number. How do … Continue reading How can you tell if a number is a composite number?