Prime and Composite Numbers

Math ⇒ Number and Operations

Prime and Composite Numbers starts at 6 and continues till grade 12. QuestionsToday has an evolving set of questions to continuously challenge students so that their knowledge grows in Prime and Composite Numbers. How you perform is determined by your score and the time you take. When you play a quiz, your answers are evaluated in concept instead of actual words and definitions used.

See sample questions for grade 6

Explain why 15 is a composite number.

Explain why 2 is a prime number.

How many prime numbers are there between 1 and 10?

List all the factors of 18.

List all the prime numbers between 10 and 20.

List the first five prime numbers.

What is the definition of a composite number?

What is the largest prime number less than 20?

What is the next prime number after 13?

What is the smallest composite number?

What is the smallest prime number greater than 50?

A teacher writes the following numbers on the board: 22, 33, 44, 55, 66. How many of these numbers are composite?

Explain why 49 is not a prime number and list all its factors.

Find the smallest composite number that is also a square number.

If a number is divisible by both 2 and 3, can it be a prime number? Explain your answer.

Is it possible for a composite number to have exactly three factors? Explain your answer.