The perimeter of a rectangle is 16cm, and its length and width are two prime numbers. What is the area of this rectangle in cm**2.
一个长方形的周长是16cm，它的长宽是两个质数，这个长方形的面积是多少cm**2．
<gadget id="calculator">5 * 3</gadget>
<output>15</output>

<result>15</result>