Exploring Prime Numbers

What is a prime number?

• A prime number is a number that can be divided by any integer.

• A prime number is a natural number less than 1.

• A prime number is any even number.

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

List the first ten prime numbers.

• 3, 5, 6, 8, 10, 12, 14, 16, 18, 20

• 2, 3, 5, 7, 11, 13, 17, 19, 23, 29

• 1, 4, 6, 8, 9, 10, 12, 14, 15, 16

• 2, 4, 6, 8, 10, 12, 14, 16, 18, 20

Is 15 a prime number? (Yes or No)

• 17

• No

• Yes

• 1

Is 2 a prime number? (Yes or No)

• No, because it is even

• Yes

• No, because it is divisible by 1

• Yes, because it is greater than 1

Identify if 29 is a prime number.

• 29 is a composite number.

• Yes, 29 is a prime number.

• 29 is an even number.

• No, 29 is not a prime number.

What is the smallest prime number?

• 1

• 2

• 3

• 5

Is 21 a prime number? (Yes or No)

• 21 is a perfect square

• No

• 21 is an even number

• 21 is a composite number

List three prime numbers greater than 10.

• 12

• 15

• 11, 13, 17

• 14

Write all the prime natural numbers between 20 and 30

Is 61 is a prime? (Write yes or no)