# Is 661 a Prime Number?

Is 661 a prime number? Numbers having only 2 factors, i.e. 1 and the number itself are known as prime numbers whereas numbers with more than 2 factors are known as composite. The answer to the question whether 661 is a prime or composite is - * "661 is a prime number."* Now, let us find out how and why is 661 a prime number or a composite number?

**Is 661 a prime number? -**Yes**Is 661 a composite number? -**No**Is 661 a perfect square? -**No**Prime Factors of 661 -**661**Factors of 661 -**1, 661

## Is 661 a Prime Number?

Yes, 661 is a prime number. The number 661 is divisible only by 1 and the number itself. For a number to be classified as a prime number, it should have exactly two factors. Since 661 has exactly two factors, i.e. 1 and 661, it is a prime number.

## How is 661 a Prime Number?

To understand whether 661 is composite or prime, it is important to find its factors.

**Factors of 661:** 1, 661

Therefore, we can say that 661 is a prime number since it has only 2 factors.

## Is 661 a Composite Number?

No, since 661 has only two factors, i.e. 1 and 661. In other words, 661 is not a composite number because 661 doesn’t have more than 2 factors.

**Problem Statements: **

Is 661 a Prime Number? | Yes |

Is 661 a Composite Number? | No |

Is 661 a Perfect Cube? | No |

Is 661 an Even Number? | No |

Multiples of 661 | 661, 1322, 1983, 2644, 3305, 3966, 4627, 5288, 5949, 6610 |

Square Root of 661 | 25.709920 |

Is 661 an Odd Number? | Yes |

Is 661 a Perfect Square? | No |

Cube Root of 661 | 8.710964 |

**Fun Facts: **

- Numbers X and Y are said to be coprime if they have only one common factor that is 1.
- Prime numbers greater than 5 can be represented in the form of either 6n + 1 or 6n - 1. Example - 89 is a prime number and it can be written as 89 = 6 × 15 - 1
- All prime numbers don't have the last digit as 5 except the number 5.

**☛ Also Check: **

- Is 83 a Prime Number? - Yes
- Is 81 a Prime Number? - No
- Is 4 a Prime Number? - No
- Is 169 a Prime Number? - No
- Is 1001 a Prime Number? - No
- Is 205 a Prime Number? - No
- Is 68 a Prime Number? - No
- Is 2013 a Prime Number? - No

visual curriculum