Is 255 a Prime Number?

Is 255 a prime number? How do you know that 255 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 255? Is 255 a prime number? "No, 255 is not a prime number." Since 255 has more than 2 factors i.e. 1, 3, 5, 15, 17, 51, 85, 255, it is a composite number. Let's study this in detail.

• Is 255 a prime number? - No
• Is 255 a composite number? - Yes
• Prime Factors of 255 - 3, 5, 17
• Is 255 a perfect square? - No
• Factors of 255 - 1, 3, 5, 15, 17, 51, 85, 255

Is 255 a Prime Number?

No, 255 is not a prime number. The number 255 is divisible by 1, 3, 5, 15, 17, 51, 85, 255. For a number to be classified as a prime number, it should have exactly two factors. Since 255 has more than two factors, i.e. 1, 3, 5, 15, 17, 51, 85, 255, it is not a prime number.

Why is 255 not a Prime Number?

To understand whether 255 is composite or prime, it is important to find its factors.

Factors of 255: 1, 3, 5, 15, 17, 51, 85, 255

Since 255 has more than 2 factors, we can say that 255 is not a prime number.

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Is 255 a Composite Number?

Yes, since 255 has more than two factors i.e. 1, 3, 5, 15, 17, 51, 85, 255. In other words, 255 is a composite number because 255 has more than 2 factors.

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Fun Facts:

• Prime numbers greater than 5 can be represented in the form of either 6n + 1 or 6n - 1. Example - 71 is a prime number and it can be written as 71 = 6 × 12 - 1
• 1 is neither prime nor composite.
• 2 is the smallest prime number.

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