The perimeter of a rectangle is 78 cm. If the number of its sides is a prime number, what is its area in square centimeters?
长方形的周长为78厘米，若它的边长的数是质数，那么它的面积是多少平方厘米．
<gadget id="calculator">2 * 37</gadget>
<output>74</output>

<result>74</result>