A 16 cm wire surrounds a rectangle, if its length and width are prime numbers, what is its area in square centimeters?
用一根16厘米的铁丝围长方形，如果长和宽都是质数，它的面积是多少平方厘米．
<gadget id="calculator">5 * 3</gadget>
<output>15</output>

<result>15</result>