Is 225 a Prime Number?

Is 225 a prime number? "No, 225 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 239 with only 2 factors, i.e. 1 and 239 are called prime numbers. However, numbers like 63 with more than 2 factors are called composite numbers. Let us find out how and why is 225 a prime number or a composite number?

• Is 225 a prime number? - No
• Is 225 a composite number? - Yes
• Factors of 225 - 1, 3, 5, 9, 15, 25, 45, 75, 225
• Prime Factors of 225 - 3, 5
• Is 225 a perfect square? - Yes

Is 225 a Prime Number?

No, 225 is not a prime number. The number 225 is divisible by 1, 3, 5, 9, 15, 25, 45, 75, 225. For a number to be classified as a prime number, it should have exactly two factors. Since 225 has more than two factors, i.e. 1, 3, 5, 9, 15, 25, 45, 75, 225, it is not a prime number.

Why is 225 not a Prime Number?

To understand whether 225 is composite or prime, it is important to find its factors.

Factors of 225: 1, 3, 5, 9, 15, 25, 45, 75, 225

Since 225 has more than 2 factors, we can say that 225 is not a prime number.

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Is 225 a Composite Number?

Yes, since 225 has more than two factors i.e. 1, 3, 5, 9, 15, 25, 45, 75, 225. In other words, 225 is a composite number because 225 has more than 2 factors.

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Fun Facts:

• 23 is the smallest prime number having consecutive digits.
• 1 is neither prime nor composite.
• A semiprime number is a composite number that is the product of exactly two prime numbers. Example - 115 is semiprime, since 115 can be written as 5 × 23.

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