# [263. Ugly Number](https://leetcode.com/problems/ugly-number/)

## 题目

Write a program to check whether a given number is an ugly number.

Ugly numbers are positive numbers whose prime factors only include 2, 3, 5.

Example 1:

```c
Input: 6
Output: true
Explanation: 6 = 2 × 3
```

Example 2:

```c
Input: 8
Output: true
Explanation: 8 = 2 × 2 × 2
```

Example 3:

```c
Input: 14
Output: false 
Explanation: 14 is not ugly since it includes another prime factor 7.
```

Note:

- 1 is typically treated as an ugly number.
- Input is within the 32-bit signed integer range: [−2^31,  2^31 − 1].


## 题目大意

判断一个数字是否是“丑陋数字”，“丑陋数字”的定义是一个正数，并且因子只包含 2，3，5 。

## 解题思路

依照题意要求做即可。