Please read the following table in HTML format from a webpage and then answer the question in detail according to the table. Each table cell is defined by a <td> and a </td> tag. Each table row starts with a <tr> and ends with a </tr> tag. 'rowspan=m' and 'colspan=n' represents a cell spaning over 'm' rows and 'n' columns.

Webpage title:
Ishikawa Prefecture
Table title:
Demographics
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Data </th><th colspan=1 rowspan=1 > Unit </th><th colspan=1 rowspan=1 > Statistics </th></tr>
<tr> <td colspan=1 rowspan=1 > Area </td><td class="highlighted"  colspan=1 rowspan=1 > km² </td><td class="highlighted"  colspan=1 rowspan=1 > 4,185 </td></tr>
<tr> <td colspan=1 rowspan=1 > Population </td><td class="highlighted"  colspan=1 rowspan=1 > Persons </td><td class="highlighted"  colspan=1 rowspan=1 > 1,166,643 </td></tr>
<tr> <td colspan=1 rowspan=1 > Population density </td><td colspan=1 rowspan=1 > Persons per km² </td><td colspan=1 rowspan=1 > 278.72 </td></tr>
<tr> <td colspan=1 rowspan=1 > Number of households </td><td colspan=1 rowspan=1 > Households </td><td colspan=1 rowspan=1 > 441,980 </td></tr>
<tr> <td colspan=1 rowspan=1 > Income per person </td><td colspan=1 rowspan=1 > Thousand yen </td><td colspan=1 rowspan=1 > 2,707 </td></tr>
<tr> <td colspan=1 rowspan=1 > Power consumed </td><td colspan=1 rowspan=1 > Kwh per household </td><td colspan=1 rowspan=1 > 6,446 </td></tr>
<tr> <td colspan=1 rowspan=1 > Number of doctors </td><td colspan=1 rowspan=1 > Physicians per 100,000 people </td><td colspan=1 rowspan=1 > 249 </td></tr>
</table>
Question:
What is the area of Ishikawa Prefecture?
Answer:
Ishikawa Prefecture has an area of 4,185 km² and a population of 1,166,643 persons.