The nearest square number

**English**RU

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You have some number and you try to find the nearest 'square' number. Square number is the number whose square root is an integer. For example, if our start number is 8, two near square number are 4 (sqrt(4) == 2) and 9 (sqrt(9) == 3). So the answer is 9, because 9 is the nearest.

**Input: ** Number

**Output: ** The nearest square number

**Example:**

nearest_square(8) == 9 nearest_square(13) == 16 nearest_square(24) == 25 nearest_square(9876) == 9801

**How it is used: **
For mathematical analysis.

**Precondition**:

0 < number <= 1000000