# 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 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.

## 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.

## 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 n
^{2}+ 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.

**☛ Also Check: **

- Is 6 a Prime Number? - No
- Is 1 a Prime Number? - No
- Is 15 a Prime Number? - No
- Is 18 a Prime Number? - No
- Is 22 a Prime Number? - No
- Is 521 a Prime Number? - Yes
- Is 463 a Prime Number? - Yes
- Is 303 a Prime Number? - No