Is 729 a Prime Number?

Is 729 a prime number? "No, 729 is not a prime number." A number can be classified as prime or composite depending on the factors it contains; it could either have only 2 factors or more than 2 factors. Numbers like 109 with only 2 factors, i.e. 1 and 109 are called prime numbers. However, numbers like 213 with more than 2 factors are called composite numbers. Let us find out how and why is 729 a prime number or a composite number?

• Is 729 a prime number? - No
• Is 729 a composite number? - Yes
• Is 729 a perfect square? - Yes
• Factors of 729 - 1, 3, 9, 27, 81, 243, 729
• Prime Factors of 729 - 3

Is 729 a Prime Number?

No, 729 is not a prime number. The number 729 is divisible by 1, 3, 9, 27, 81, 243, 729. For a number to be classified as a prime number, it should have exactly two factors. Since 729 has more than two factors, i.e. 1, 3, 9, 27, 81, 243, 729, it is not a prime number.

Why is 729 not a Prime Number?

To understand whether 729 is prime or composite, it is important to find its factors.

Factors of 729: 1, 3, 9, 27, 81, 243, 729

Since 729 has more than 2 factors, we can say that 729 is not a prime number.

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Is 729 a Composite Number?

Yes, since 729 has more than two factors i.e. 1, 3, 9, 27, 81, 243, 729. In other words, 729 is a composite number because 729 has more than 2 factors.

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Fun Facts:

• 5 is the only prime number having the last digit as 5.
• A perfect square (square number) is always a composite number.
• 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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