Is 991 a Prime Number?

Is 991 a prime number? Yes. 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 991 a prime number? According to the definition mentioned above, we can say, "yes, 991 is a prime number." Now let us take a look at the detailed solution of why is 991 a prime number?

• Is 991 a prime number? - Yes
• Is 991 a composite number? - No
• Factors of 991 - 1, 991
• Prime Factors of 991 - 991
• Is 991 a perfect square? - No

Is 991 a Prime Number?

Yes, 991 is a prime number. The number 991 is divisible only by 1 and the number itself. For a number to be classified as a prime number, it should have exactly two factors, 1 and the number itself. Since 991 has exactly two factors, i.e., 1 and 991, it is a prime number.

How is 991 a Prime Number?

To understand whether 991 is composite or prime, it is important to find its factors.

Factors of 991: 1, 991

Therefore, we can say that 991 is a prime number since it has only 2 factors.

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Is 991 a Composite Number?

No, since 991 has only two factors, i.e., 1 and 991. In other words, 991 is not a composite number because 991 doesn’t have more than 2 factors.

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Fun Facts:

• A semiprime number is a composite number that is the product of exactly two prime numbers. Example - 697 is semiprime, since 697 can be written as 17 × 41.
• Numbers X and Y are said to be coprime if they have only one common factor that is 1.
• A palindrome prime is a prime number that when read in reverse order results in the same number. Examples - 787, 373, 353

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