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Fundamentals of Number Theory

Number Theory

A collection of high school level questions covering basic properties of integers, primes, and divisibility.

mathematics integers primes divisibility

10 Questions Easy Ages 14+ Apr 22, 2026

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About this Study Set

This study set covers Number Theory through 10 practice questions. A collection of high school level questions covering basic properties of integers, primes, and divisibility. Every question includes the correct answer so you can learn as you go — pick any format above to get started.

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Browse all 10 questions from the Fundamentals of Number Theory study set below. Each question shows the correct answer — select a study format above to practice interactively.

1 What is the smallest prime number?

2 Which of the following numbers is a perfect square?

A 12
B 24
C 36
D 48

3 What is the Greatest Common Divisor (GCD) of 12 and 18?

4 Which of these numbers is a composite number?

A 7
B 11
C 13
D 15

5 What is the result of 15 modulo 4?

6 Which of the following is an even prime number?

7 What is the prime factorization of 10?

A 2 x 5
B 1 x 10
C 2 + 8
D 2 x 2 x 2

8 Which number is neither prime nor composite?

9 What is the Least Common Multiple (LCM) of 4 and 6?

A 2
B 10
C 12
D 24

10 How many factors does the number 7 have?

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