Prime numbers and composite numbers - Examples, Exercises and Solutions

Definitions of Prime Numbers and Composite Numbers

Prime number

A prime number is a natural number that is divisible only by itself and by 11.

Composite number

A composite number is a number that can be written as the product of two natural numbers smaller than it, with the exception of 11 and itself.

The number 11 –> is a special number that is neither prime nor composite.
The number 22 –> is the only even number that is prime.

Practice Prime numbers and composite numbers

Exercise #1

Is the number equal to n n prime or composite?

n=10 n=10

Video Solution

Answer

Composite

Exercise #2

Is the number equal to n n prime or composite?

n=42 n=42

Video Solution

Answer

Composite

Exercise #3

Is the number equal to n n prime or composite?

n=20 n=20

Video Solution

Answer

Composite

Exercise #4

Is the number equal to n n prime or composite?

n=36 n=36

Video Solution

Answer

Composite

Exercise #5

Is the number equal to n n prime or composite?

n=22 n=22

Video Solution

Answer

Composite

Exercise #1

Is the number equal to n n prime or composite?

n=8 n=8

Video Solution

Answer

Composite

Exercise #2

Is the number equal to n n prime or composite?

n=4 n=4

Video Solution

Answer

Composite

Exercise #3

Is the number equal to n n prime or composite?

n=7 n=7

Video Solution

Answer

Prime

Exercise #4

Is the number equal to n n prime or composite?

n=29 n=29

Video Solution

Answer

Prime

Exercise #5

Is the number equal to n n prime or composite?

n=19 n=19

Video Solution

Answer

Prime

Exercise #1

Is the number equal to n n prime or composite?

n=23 n=23

Video Solution

Answer

Prime

Exercise #2

Is the number equal to n n prime or composite?

n=17 n=17

Video Solution

Answer

Prime

Exercise #3

Which of the numbers is a prime number?

Video Solution

Answer

11 11

Exercise #4

Is the number equal to n n prime or composite?

n=14 n=14

Video Solution

Answer

Composite

Exercise #5

What type of number is the number n shown below?

n=11 n=11

Video Solution

Answer

Prime

Topics learned in later sections

  1. Prime Factorization
  2. Prime Factorization with Exponents
  3. Divisibility Rules for 2, 4, and 10
  4. Divisibility Rules for 3, 6, and 9