Is 28 a Prime Number?

Is 28 a prime number? How do you know that 28 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 28? Is 28 a prime number? "No, 28 is not a prime number." Since 28 has more than 2 factors i.e. 1, 2, 4, 7, 14, 28, it is a composite number. Let's study this in detail.

• Is 28 a prime number? - No
• Is 28 a composite number? - Yes
• Factors of 28 - 1, 2, 4, 7, 14, 28
• Prime Factors of 28 - 2, 7
• Is 28 a perfect square? - No

Is 28 a Prime Number?

No, 28 is not a prime number. The number 28 is divisible by 1, 2, 4, 7, 14, 28. For a number to be classified as a prime number, it should have exactly two factors. Since 28 has more than two factors, i.e. 1, 2, 4, 7, 14, 28, it is not a prime number.

Why is 28 not a Prime Number?

To understand whether 28 is composite or prime, it is important to find its factors.

Factors of 28: 1, 2, 4, 7, 14, 28

Since 28 has more than 2 factors, we can say that 28 is not a prime number.

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Is 28 a Composite Number?

Yes, since 28 has more than two factors i.e. 1, 2, 4, 7, 14, 28. In other words, 28 is a composite number because 28 has more than 2 factors.

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Fun Facts:

• Numbers X and Y are said to be coprime if they have only one common factor that is 1.
• 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.
• A palindrome prime is a prime number that when read in reverse order results in the same number. Examples - 10601, 11311, 12421

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