Among the following 4 numbers, exactly one number is the product of two adjacent integers, what is this number?
下面4个数中，恰有一个数是两个相邻整数的乘积，这个数是多少
<gadget id="calculator">2_257 * 2_258</gadget>
<output>5_096_306</output>

<result>5_096_306</result>