Is 85 a Prime Number?

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

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

Is 85 a Prime Number?

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

Why is 85 not a Prime Number?

To understand whether 85 is composite or prime, it is important to find its factors.

Factors of 85: 1, 5, 17, 85

Since 85 has more than 2 factors, we can say that 85 is not a prime number.

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Is 85 a Composite Number?

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

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Fun Facts:

• A pair of prime numbers X and Y are said to be twin prime numbers if the absolute difference between them is 2. Example - (311, 313) are twin prime numbers.
• Numbers X and Y are said to be coprime if they have only one common factor that is 1.
• Euler discovered a polynomial n² + n + 41 that produces prime numbers for values of n that lie between 0 and 39 inclusive. It can generate 40 prime numbers for 0 <= n <= 39.

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