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

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?

$$ n=10 $$

Exercise #6

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

$n=36$

Video Solution

Answer

Composite

Exercise #7

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

$n=20$

Video Solution

Answer

Composite

Exercise #8

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

$n=17$

Video Solution

Answer

Prime

Exercise #9

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

$n=42$

Video Solution

Answer

Composite

Exercise #10

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

$n=10$

Video Solution

Answer

Composite

Question 1

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

$$ n=23 $$

Question 2

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

$$ n=19 $$

Question 3

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

$$ n=29 $$

Question 4

Which of the numbers is a prime number?

Question 5

Which of the numbers is a prime number?

Exercise #11

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

$n=23$

Video Solution

Answer

Prime

Exercise #12

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

$n=19$

Video Solution

Answer

Prime

Exercise #13

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

$n=29$

Video Solution

Answer

Prime

Exercise #14

Which of the numbers is a prime number?

Video Solution

Answer

$11$

Exercise #15

Which of the numbers is a prime number?

Video Solution

Answer

$7$

Topics learned in later sections