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 $1$.

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 $1$ and itself.

The number $1$ –> is a special number that is neither prime nor composite.
The number $2$ –> is the only even number that is prime.

Practice Prime numbers and composite numbers

Exercise #1

Is the number equal to $n$ prime or composite?

$n=10$

Composite

Exercise #2

Is the number equal to $n$ prime or composite?

$n=42$

Composite

Exercise #3

Is the number equal to $n$ prime or composite?

$n=20$

Composite

Exercise #4

Is the number equal to $n$ prime or composite?

$n=36$

Composite

Exercise #5

Is the number equal to $n$ prime or composite?

$n=22$

Composite

Exercise #1

Is the number equal to $n$ prime or composite?

$n=8$

Composite

Exercise #2

Is the number equal to $n$ prime or composite?

$n=4$

Composite

Exercise #3

Is the number equal to $n$ prime or composite?

$n=7$

Prime

Exercise #4

Is the number equal to $n$ prime or composite?

$n=29$

Prime

Exercise #5

Is the number equal to $n$ prime or composite?

$n=19$

Prime

Exercise #1

Is the number equal to $n$ prime or composite?

$n=23$

Prime

Exercise #2

Is the number equal to $n$ prime or composite?

$n=17$

Prime

Exercise #3

Which of the numbers is a prime number?

Video Solution

$11$

Exercise #4

Is the number equal to $n$ prime or composite?

$n=14$

Composite

Exercise #5

What type of number is the number n shown below?

$n=11$