Prime and Composite Numbers

What is a prime number?

• A prime number is a number that can be divided by 2

• A prime number is a number that ends in 0 or 5

• A prime number is a number that is a multiple of 3

• A prime number is a natural number greater than 1 that has no positive divisors other than 1 and itself.

Is 1 a prime number? Why or why not?

• Yes

• No, because it is divisible by 2

• No, because it is divisible by 5

• No, because it is divisible by 3

List the first 5 prime numbers.

• 2, 4, 6, 8, 10

• 2, 3, 5, 7, 11

• 3, 5, 7, 9, 11

• 1, 3, 5, 7, 9

What is a composite number?

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

• A composite number is a number that is always a multiple of 2.

• A composite number is a positive integer that has at least one positive divisor other than 1 and itself.

• A composite number is a number that is always a prime number.

Is 15 a prime or composite number? Explain your answer.

• Prime

• Odd

• Composite

• Even

Find the factors of 24.

• 1,24,2,12,3,8

• 3,2,1,8

• 1,2,3,4,5

• 24 x 1

Determine whether 37 is a prime or composite number.

• Odd

• Prime

• Composite

• Even

Explain the difference between prime and composite numbers.

• Composite numbers are only divisible by 1 and themselves, while prime numbers have multiple divisors.

• Prime numbers are always even, while composite numbers are always odd.

• Prime numbers have only two factors, while composite numbers have more than two factors.

• Prime numbers have more factors than composite numbers.

What is the smallest prime number?

• 4

• 1

• 2

• 3

Determine if 9 is prime or composite?

• prime

• composite