Understanding Prime Numbers

What is a prime number?

• A number that can only be divided by itself and 1 without remainders.

• A number that can be divided by any number without remainders.

• A number that is less than 1.

• A number that is a multiple of 10.

Which of the following is a prime number?

• 21

• 15

• 13

• 9

Why is 1 not considered a prime number?

• Because it is an even number.

• Because it has only one factor.

• Because it is a composite number.

• Because it is a multiple of 2.

What is the smallest prime number?

• 5

• 3

• 2

• 1

Which of the following numbers is not a prime number?

• 59

• 39

• 19

• 29

How many prime numbers are there between 1 and 100?

• 20

• 25

• 30

• 35

Which of the following is a property of prime numbers?

• They have exactly two factors.

• They can be divided by 10.

• They are always greater than 100.

• They are always even.

What is the sum of the first two prime numbers?

• 3

• 7

• 9

• 5

Which of the following pairs of numbers are both prime?

• 4 and 5

• 14 and 15

• 6 and 7

• 11 and 13

What is the largest known prime number as of November 2020?

• 277,232,917 − 1

• 999,999,937

• 282,589,933 − 1

• 1,000,000,007