# 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.

## 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.

**Problem Statements: **

Is 155 a Prime Number? | No |

Is 155 a Composite Number? | Yes |

Multiples of 155 | 155, 310, 465, 620, 775, 930, 1085, 1240, 1395, 1550 |

Square Root of 155 | 12.4499 |

Is 155 an Even Number? | No |

Is 155 a Perfect Square? | No |

Cube Root of 155 | 5.371676 |

Is 155 an Odd Number? | Yes |

Is 155 a Perfect Cube? | No |

Square of 155 | 24025 |

**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

**☛ Also Check: **

- Is 81 a Prime Number? - No
- Is 2 a Prime Number? - Yes
- Is 63 a Prime Number? - No
- Is 64 a Prime Number? - No
- Is 91 a Prime Number? - No
- Is 961 a Prime Number? - No
- Is 2011 a Prime Number? - Yes
- Is 533 a Prime Number? - No

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