Is 138 a Prime Number?

Is 138 a prime number? How do you know that 138 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 138? Is 138 a prime number? "No, 138 is not a prime number." Since 138 has more than 2 factors i.e. 1, 2, 3, 6, 23, 46, 69, 138, it is a composite number. Let's study this in detail.

• Is 138 a prime number? - No
• Is 138 a composite number? - Yes
• Prime Factors of 138 - 2, 3, 23
• Factors of 138 - 1, 2, 3, 6, 23, 46, 69, 138
• Is 138 a perfect square? - No

Is 138 a Prime Number?

No, 138 is not a prime number. The number 138 is divisible by 1, 2, 3, 6, 23, 46, 69, 138. For a number to be classified as a prime number, it should have exactly two factors. Since 138 has more than two factors, i.e. 1, 2, 3, 6, 23, 46, 69, 138, it is not a prime number.

Why is 138 not a Prime Number?

To understand whether 138 is composite or prime, it is important to find its factors.

Factors of 138: 1, 2, 3, 6, 23, 46, 69, 138

Since 138 has more than 2 factors, we can say that 138 is not a prime number.

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Is 138 a Composite Number?

Yes, since 138 has more than two factors i.e. 1, 2, 3, 6, 23, 46, 69, 138. In other words, 138 is a composite number because 138 has more than 2 factors.

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Fun Facts:

• 2 is the smallest prime number.
• A palindrome prime is a prime number that when read in reverse order results in the same number. Examples - 10601, 11311, 12421
• 5 is the only prime number having the last digit as 5.

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