Is 171 a Prime Number?

Is 171 a prime number? How do you know that 171 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 171? Is 171 a prime number? "No, 171 is not a prime number." Since 171 has more than 2 factors i.e. 1, 3, 9, 19, 57, 171, it is a composite number. Let's study this in detail.

• Is 171 a prime number? - No
• Is 171 a composite number? - Yes
• Factors of 171 - 1, 3, 9, 19, 57, 171
• Is 171 a perfect square? - No
• Prime Factors of 171 - 3, 19

Is 171 a Prime Number?

No, 171 is not a prime number. The number 171 is divisible by 1, 3, 9, 19, 57, 171. For a number to be classified as a prime number, it should have exactly two factors. Since 171 has more than two factors, i.e. 1, 3, 9, 19, 57, 171, it is not a prime number.

Why is 171 not a Prime Number?

To understand whether 171 is composite or prime, it is important to find its factors.

Factors of 171: 1, 3, 9, 19, 57, 171

Since 171 has more than 2 factors, we can say that 171 is not a prime number.

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Is 171 a Composite Number?

Yes, since 171 has more than two factors i.e. 1, 3, 9, 19, 57, 171. In other words, 171 is a composite number because 171 has more than 2 factors.

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Fun Facts:

• 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
• All primes except 2 are odd.

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