# Is 66 a Prime Number?

Is 66 a prime number? * "No, 66 is not a prime number."* A number can be classified as prime or composite depending on the factors it contains; it could either have only 2 factors or more than 2 factors. Numbers like 659 with only 2 factors, i.e. 1 and 659 are called prime numbers. However, numbers like 646 with more than 2 factors are called composite numbers. Let us find out how and why is 66 a prime number or a composite number?

**Is 66 a prime number? -**No**Is 66 a composite number? -**Yes**Factors of 66 -**1, 2, 3, 6, 11, 22, 33, 66**Is 66 a perfect square? -**No**Prime Factors of 66 -**2, 3, 11

## Is 66 a Prime Number?

No, 66 is not a prime number. The number 66 is divisible by 1, 2, 3, 6, 11, 22, 33, 66. For a number to be classified as a prime number, it should have exactly two factors. Since 66 has more than two factors, i.e. 1, 2, 3, 6, 11, 22, 33, 66, it is not a prime number.

## Why is 66 not a Prime Number?

To understand whether 66 is composite or prime, it is important to find its factors.

**Factors of 66:** 1, 2, 3, 6, 11, 22, 33, 66

Since 66 has more than 2 factors, we can say that 66 is not a prime number.

## Is 66 a Composite Number?

Yes, since 66 has more than two factors i.e. 1, 2, 3, 6, 11, 22, 33, 66. In other words, 66 is a composite number because 66 has more than 2 factors.

**Problem Statements: **

Is 66 a Prime Number? | No |

Is 66 a Composite Number? | Yes |

Multiples of 66 | 66, 132, 198, 264, 330, 396, 462, 528, 594, 660 |

Is 66 a Perfect Cube? | No |

Cube Root of 66 | 4.041234 |

Is 66 a Perfect Square? | No |

Is 66 an Odd Number? | No |

Square Root of 66 | 8.124038 |

Is 66 an Even Number? | Yes |

Square of 66 | 4356 |

**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
- A pair of prime numbers X and Y are said to be twin prime numbers if the absolute difference between them is 2. Example - (311, 313) are twin prime numbers.
- 23 is the smallest prime number having consecutive digits.

**☛ Also Check: **

- Is 113 a Prime Number? - Yes
- Is 21 a Prime Number? - No
- Is 27 a Prime Number? - No
- Is 123 a Prime Number? - No
- Is 109 a Prime Number? - Yes
- Is 171 a Prime Number? - No
- Is 207 a Prime Number? - No
- Is 138 a Prime Number? - No

visual curriculum