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A day full of math games & activities. Find one near you.
A day full of math games & activities. Find one near you.

Is 128 a Prime Number?

Is 128 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 128 a prime number? According to the definition mentioned above, we can say "No, 128 is not a prime number." Now let us take a look at the detailed solution of why is 128 a prime number or a composite number?

  • Is 128 a prime number? - No
  • Is 128 a composite number? - Yes
  • Factors of 128 - 1, 2, 4, 8, 16, 32, 64, 128
  • Prime Factors of 128 - 2
  • Is 128 a perfect square? - No

Is 128 a Prime or Composite?

Is 128 a Prime Number?

No, 128 is not a prime number. The number 128 is divisible by 1, 2, 4, 8, 16, 32, 64, 128. For a number to be classified as a prime number, it should have exactly two factors. Since 128 has more than two factors, i.e. 1, 2, 4, 8, 16, 32, 64, 128, it is not a prime number.

Is 128 a Prime Number?

Why is 128 not a Prime Number?

To understand whether 128 is composite or prime, it is important to find its factors.

Factors of 128: 1, 2, 4, 8, 16, 32, 64, 128

Since 128 has more than 2 factors, we can say that 128 is not a prime number.

☛ Prime Number Calculator

Is 128 a Composite Number?

Yes, since 128 has more than two factors i.e. 1, 2, 4, 8, 16, 32, 64, 128. In other words, 128 is a composite number because 128 has more than 2 factors.

Problem Statements:

Is 128 a Prime Number? No
Is 128 a Composite Number? Yes
Is 128 an Even Number? Yes
Square Root of 128 11.313708
Is 128 a Perfect Square? No
Square of 128 16384
Multiples of 128 128, 256, 384, 512, 640, 768, 896, 1024, 1152, 1280
Is 128 an Odd Number? No
Is 128 a Perfect Cube? No
Cube Root of 128 5.039676

Fun Facts:

  • 5 is the only prime number having the last digit as 5.
  • 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
  • Euler discovered a polynomial n2 + n + 41 that produces prime numbers for values of n that lie between 0 and 39 inclusive. It can generate 40 prime numbers for 0 <= n <= 39.

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