Is 999 a Prime Number?

Is 999 a prime number? No. If a number has only two factors, i.e., 1 and the number itself, it is known as a prime number. In contrast, composite numbers have more than two factors. By this explanation, can we answer the question - is 999 a prime number? According to the definition mentioned above, we can say "No, 999 is not a prime number." Now let us take a look at the detailed solution of why is 999 a prime number or a composite number?

• Is 999 a prime number? - No
• Is 999 a composite number? - Yes
• Factors of 999 - 1, 3, 9, 27, 37, 111, 333, 999
• Is 999 a perfect square? - No
• Prime Factors of 999 - 3, 37

Is 999 a Prime Number?

No, 999 is not a prime number. The number 999 is divisible by 1, 3, 9, 27, 37, 111, 333, 999. For a number to be classified as a prime number, it should have exactly two factors. Since 999 has more than two factors, i.e., 1, 3, 9, 27, 37, 111, 333, 999, it is not a prime number.

Why is 999 not a Prime Number?

To understand whether 999 is prime or composite, it is important to find its factors.

Factors of 999: 1, 3, 9, 27, 37, 111, 333, 999

Since 999 has more than 2 factors, we can say that 999 is not a prime number.

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Is 999 a Composite Number?

Yes, since 999 has more than two factors i.e. 1, 3, 9, 27, 37, 111, 333, 999. In other words, 999 is a composite number because 999 has more than 2 factors.

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Fun Facts:

• 5 is the only prime number having the last digit as 5.
• A perfect square (square number) is always a composite number.
• A semiprime number is a composite number that is the product of exactly two prime numbers. Example - 115 is a semiprime number because 115 can be written as 5 × 23.

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