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.

Detailed explanation

Practice Prime numbers and composite numbers

Question 1

Which of the numbers is a prime number?

Question 2

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

$$ n=4 $$

Question 3

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

$$ n=7 $$

Question 4

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

$$ n=8 $$

Question 5

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

$$ n=22 $$

examples with solutions for prime numbers and composite numbers

Exercise #1

Which of the numbers is a prime number?

Video Solution

Answer

$11$

Exercise #2

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

$n=4$

Video Solution

Answer

Composite

Exercise #3

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

$n=7$

Video Solution

Answer

Prime

Exercise #4

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

$n=8$

Video Solution

Answer

Composite

Exercise #5

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

$n=22$

Video Solution

Answer

Composite

Question 1

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

$$ n=36 $$

Question 2

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

$$ n=20 $$

Question 3

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

$$ n=17 $$

Question 4

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

$$ n=42 $$

Question 5

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

$$ n=10 $$