Identifying Prime and Composite Numbers

What is a prime number?

• A number that can only be divided by 1 and itself.

• A number that can be divided by 2 and 3.

• A number that can be divided by 1, 2, and 3.

• A number that can be divided by any number.

Why is the number 1 not considered a prime number?

• Because it only has one factor.

• Because it is odd.

• Because it is a composite number.

• Because it is even.

Which of the following is a prime number?

• 8

• 4

• 5

• 6

Which of the following numbers is not a prime number?

• 23

• 19

• 21

• 17

Why is 2 considered a unique prime number?

• Because it is the largest prime number.

• Because it is divisible by 3.

• Because it is the only even prime number.

• Because it is the smallest number.

How can you determine if a number is prime?

• By checking if it is even.

• By checking if it is a multiple of 10.

• By dividing it by 2 and 3 only.

• By dividing it by all numbers up to its square root.

What is a composite number?

• A number that is odd.

• A number that is even.

• A number that is not prime and is divisible by numbers other than 1 and itself.

• A number that can only be divided by 1 and itself.

Which of the following is a composite number?

• 7

• 11

• 13

• 9

What is the main characteristic of composite numbers?

• They can only be divided by 1 and themselves.

• They are all odd.

• They have more than two factors.

• They are all even.

Which of the following is not a composite number?

• 5

• 8

• 10

• 4