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Is 9 a Prime Number?

Is 9 a prime number? How do you know that 9 is prime or composite? Let us first understand what makes a number 'prime'. If a number has only 2 factors (1 and the number itself), then it is a prime number. If the number has more than 2 factors, then it is composite. Now, what do you think of 9? Is 9 a prime number? "No, 9 is not a prime number." Since 9 has more than 2 factors i.e. 1, 3, 9, it is a composite number. Let's study this in detail.

Is 9 a prime number? - No
Is 9 a composite number? - Yes
Factors of 9 - 1, 3, 9
Is 9 a perfect square? - Yes
Prime Factors of 9 - 3

Is 9 a Prime or Composite?

Is 9 a Prime Number?

No, 9 is not a prime number. The number 9 is divisible by 1, 3, 9. For a number to be classified as a prime number, it should have exactly two factors. Since 9 has more than two factors, i.e. 1, 3, 9, it is not a prime number.

Is 9 a Prime Number?

Why is 9 not a Prime Number?

To understand whether 9 is composite or prime, it is important to find its factors.

Factors of 9: 1, 3, 9

Since 9 has more than 2 factors, we can say that 9 is not a prime number.

☛ Prime Number Calculator

Is 9 a Composite Number?

Yes, since 9 has more than two factors i.e. 1, 3, 9. In other words, 9 is a composite number because 9 has more than 2 factors.

Problem Statements:

Is 9 a Prime Number?	No
Is 9 a Composite Number?	Yes
Multiples of 9	9, 18, 27, 36, 45, 54, 63, 72, 81, 90
Cube Root of 9	2.080082
Is 9 an Even Number?	No
Is 9 a Perfect Square?	Yes
Is 9 a Perfect Cube?	No
Square Root of 9	3
Square of 9	81
Is 9 an Odd Number?	Yes

Fun Facts:

A perfect square (square number) is always a composite number.
5 is the only prime number having the last digit as 5.
1 is neither prime nor composite.

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