Using the composite number calculator below, you can check whether a given
number is composite or not. This composite number checker is a free online tool for
mathematicians and students. Apart from checking whether a number is composite
or not, you can also find all the factors of a number.
Composite numbers are numbers that have more than two factors. The numbers
with two or less than two factors are not classified as composite numbers. Instead,
they are defined as prime numbers.
How to use the composite number checker tool
Step 1: Click on the textbox besides the text “Enter a number to check if it is a
Composite Number” and then enter the number.
Step 2: Click on the blue Check button to find whether the number is composite or
Step 3: The results are shown along with the definition of a composite number and
the reason why the number is or isn’t a composite number. You can also view all the
possible factors of the entered number.
To clear the entered number, click on the Reset button.
Examples to check on composite number tool
Before you use this tool, have a look at these examples:
Is 7 a composite number?
No, 7 is not a composite number as it has exactly two factors, 1 and 7.
Is 40 a composite number?
Yes, 40 is a composite number as it has more than two factors, 1, 2, 4, 5, 8,
10, 20 and 40.
Is 91 a composite number?
Yes, 91 is a composite number because it has four factors which are 1, 7, 13, and 91.