Understanding Prime Numbers and Factors

The video tutorial introduces the concept of prime numbers, explaining that they have exactly two factors: 1 and the number itself. It provides examples of prime numbers and non-prime numbers, demonstrating how to identify them by finding their factors. The tutorial includes practice exercises to reinforce understanding and concludes with a summary of the key points.

What is a prime number?

• A number that is odd.

• A number with exactly two factors: 1 and itself.

• A number with more than two factors.

• A number that is even.

Which of the following is a prime number?

• 7

• 6

• 8

• 4

Why is the number 1 not considered a prime number?

• It has more than two factors.

• It is an even number.

• It has only one factor.

• It is an odd number.

What are the factors of the number 4?

• 1 and 4

• 1, 2, and 4

• 1, 3, and 4

• 2 and 4

Which of the following numbers is a prime number?

• 12

• 11

• 10

• 9

What are the factors of the number 6?

• 1, 2, 3, and 6

• 1, 2, and 6

• 1, 3, and 6

• 2, 3, and 6

Which of the following numbers is NOT a prime number?

• 5

• 3

• 2

• 8

What are the factors of the number 21?

• 1, 2, 3, and 21

• 1, 3, 7, and 21

• 1, 7, and 21

• 1, 3, and 21

Which of the following numbers is a prime number?

• 20

• 21

• 22

• 23

Why is the number 23 considered a prime number?

• It has exactly two factors: 1 and 23.

• It is an odd number.

• It has only one factor.

• It is an even number.