Cut out the largest possible square from a piece of rectangular paper with a length of 1394 mm and a width of 646 mm. If the remaining part is not a square, then cut another square with the largest possible side length from the remaining paper, according to The above process is repeated continuously. What is the side length of the final cut square in millimeters?
从一张长1394毫米，宽646毫米的长方形纸上剪裁出尽可能大的正方形，如果剩下的部分不是正方形，那么在剩下的纸片上再裁下一个边长尽可能大的正方形，按照上面的过程不断地重复，最后剪得的正方形的边长是多少毫米？
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