Is 561 a Prime Number | Is 561 a Prime or Composite Number? (2024)

Is 561 a prime number? "No, 561 is not a prime number." A number can be classified as prime or composite depending on the factors it contains; it could either have only 2 factors or more than 2 factors. Numbers like 31 with only 2 factors, i.e. 1 and 31 are called prime numbers. However, numbers like 462 with more than 2 factors are called composite numbers. Let us find out how and why is 561 a prime number or a composite number?

Is 561 a Prime Number?

No, 561 is not a prime number. The number 561 is divisible by 1, 3, 11, 17, 33, 51, 187, 561. For a number to be classified as a prime number, it should have exactly two factors. Since 561 has more than two factors, i.e. 1, 3, 11, 17, 33, 51, 187, 561, it is not a prime number.

Why is 561 not a Prime Number?

To understand whether 561 is prime or composite, it is important to find its factors.

Factors of 561: 1, 3, 11, 17, 33, 51, 187, 561

Since 561 has more than 2 factors, we can say that 561 is not a prime number.

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Is 561 a Composite Number?

Yes, since 561 has more than two factors i.e. 1, 3, 11, 17, 33, 51, 187, 561. In other words, 561 is a composite number because 561 has more than 2 factors.

Problem Statements:

Is 561 a Prime Number?	No
Is 561 a Composite Number?	Yes
Is 561 a Perfect Square?	No
Square of 561	314721
Cube Root of 561	8.247457
Is 561 an Even Number?	No
Square Root of 561	23.685439
Is 561 an Odd Number?	Yes
Multiples of 561	561, 1122, 1683, 2244, 2805, 3366, 3927, 4488, 5049, 5610
Is 561 a Perfect Cube?	No

Fun Facts:

23 is the smallest prime number having consecutive digits.
5 is the only prime number having the last digit as 5.
A palindrome prime is a prime number that when read in reverse order results in the same number. Examples - 10601, 11311, 12421

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