Is 155 a Prime Number?

Is 155 a prime number? If a number has only two factors, i.e. 1 and the number itself, it is known as a prime number. In contrast, composite numbers have more than two factors. By this explanation, can we answer the question - is 155 a prime number? According to the definition mentioned above, we can say "No, 155 is not a prime number." Now let us take a look at the detailed solution of why is 155 a prime number or a composite number?

• Is 155 a prime number? - No
• Is 155 a composite number? - Yes
• Factors of 155 - 1, 5, 31, 155
• Prime Factors of 155 - 5, 31
• Is 155 a perfect square? - No

Is 155 a Prime Number?

No, 155 is not a prime number. The number 155 is divisible by 1, 5, 31, 155. For a number to be classified as a prime number, it should have exactly two factors. Since 155 has more than two factors, i.e. 1, 5, 31, 155, it is not a prime number.

Why is 155 not a Prime Number?

To understand whether 155 is composite or prime, it is important to find its factors.

Factors of 155: 1, 5, 31, 155

Since 155 has more than 2 factors, we can say that 155 is not a prime number.

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Is 155 a Composite Number?

Yes, since 155 has more than two factors i.e. 1, 5, 31, 155. In other words, 155 is a composite number because 155 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
• All primes except 2 are odd.
• 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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