# Is 90 a Prime Number?

Is 90 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 90 a prime number? According to the definition mentioned above, we can say * "No, 90 is not a prime number."* Now let us take a look at the detailed solution of why is 90 a prime number or a composite number?

**Is 90 a prime number? -**No**Is 90 a composite number? -**Yes**Factors of 90 -**1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90**Prime Factors of 90 -**2, 3, 5**Is 90 a perfect square? -**No

## Is 90 a Prime Number?

No, 90 is not a prime number. The number 90 is divisible by 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90. For a number to be classified as a prime number, it should have exactly two factors. Since 90 has more than two factors, i.e. 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90, it is not a prime number.

## Why is 90 not a Prime Number?

To understand whether 90 is prime or composite, it is important to find its factors.

**Factors of 90:** 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90

Since 90 has more than 2 factors, we can say that 90 is not a prime number.

## Is 90 a Composite Number?

Yes, since 90 has more than two factors i.e. 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90. In other words, 90 is a composite number because 90 has more than 2 factors.

**Problem Statements: **

Is 90 a Prime Number? | No |

Is 90 a Composite Number? | Yes |

Square Root of 90 | 9.486833 |

Square of 90 | 8100 |

Is 90 an Even Number? | Yes |

Is 90 a Perfect Square? | No |

Is 90 a Perfect Cube? | No |

Multiples of 90 | 90, 180, 270, 360, 450, 540, 630, 720, 810, 900 |

Cube Root of 90 | 4.481398 |

Is 90 an Odd Number? | No |

**Fun Facts: **

- A palindrome prime is a prime number that when read in reverse order results in the same number. Examples - 10601, 11311, 12421
- 1 is neither prime nor composite.
- A perfect square (square number) is always a composite number.

**☛ Also Check: **

- Is 100 a Prime Number? - No
- Is 5 a Prime Number? - Yes
- Is 119 a Prime Number? - No
- Is 75 a Prime Number? - No
- Is 149 a Prime Number? - Yes
- Is 90 a Prime Number? - No
- Is 84 a Prime Number? - No
- Is 279 a Prime Number? - No

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