If a rectangle is surrounded by a wire with a length of 16 cm, and its length and width are required to be prime numbers, what is its area in square centimeters
用一条长16厘米的铁丝围成一个长方形，要求长和宽均为质数，则它的面积为多少平方厘米
<gadget id="calculator">3 * 5</gadget>
<output>15</output>

<result>15</result>