Is 11 a prime number or a composite number?

We can classify whole numbers as prime numbers or composite numbers based on the numbers of their factors. In this article, we will learn whether 11 is a prime number or a composite number.

Is 11 a Prime Number?

By definition, a prime number has factors 1 and the number itself. So the prime numbers have only two factors.

We know that 11 is divisible by 1 and 11 only.

So the factors of 11 are 1 and 11. ⇒ 11 has two factors.

∴ 11 is a prime number.

Is 11 a Composite Number?

We know that a composite number always has more than two factors. As 11 has only two factors: 1 and the number 11 itself, we deduce that

11 is not a composite number.

Also Read: Is 2 a prime number

Facts about 11:

Is 11 a prime number?	Yes, 11 is a prime number.
Is 11 a composite number?	No, 11 is not a composite number.
Square of 11	112 = 11×11 = 121
Square root of 11	√11 = 3.317
Cube root of 11	$\sqrt[3]{11}=2.224$
Is 11 a perfect square?	As the square root of 11 is not a whole number, 11 is not a perfect square.
Is 11 a perfect cube?	As the cube root of 11 is not a whole number, 11 is not a perfect cube.
Is 11 an even number?	As 11 is not divisible by 2, we deduce that 11 is not an even number.
Is 11 an odd number?	As 2 does not divide 11, the number 11 is an odd number.
Multiples of 11	The first five multiples of 11 are 11, 22, 33, 44, and 55.
Divisors of 11	1 and 11
Factors of 11	1 and 11
Prime factors of 11	11 is the only prime factor of 11
Prime divisor of 11	11 is the only prime divisor of 11

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• Factors of 11
• Multiples of 11

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