Prime Numbers Explained

This video tutorial covers the concept of prime numbers, explaining their definition and providing examples to distinguish them from composite numbers. It details the process of checking if a number is prime through divisibility tests and highlights patterns observed in prime numbers. The video concludes with practice questions for viewers to reinforce their understanding.

Which of the following numbers is a prime number?

• 8

• 25

• 17

• 20

What is a composite number?

• A number with more than two factors

• A number with only one factor

• A number with exactly two factors

• A number that is divisible by 1 and itself only

Why is the number one not considered a prime number?

• It is an even number

• It is a composite number

• It has only one factor

• It is divisible by more than two numbers

How can you determine if a number like 97 is prime?

• Check if it is divisible by any number up to half of itself

• Check if it is divisible by any number up to 10

• Check if it is divisible by any number up to its square root

• Check if it is divisible by any number up to itself

What is a common characteristic of prime numbers greater than 5?

• They all end in 6, 8, or 0

• They all end in 5

• They all end in 1, 3, 7, or 9

• They all end in 0, 2, or 4