![\"\"](\"/userfiles/image/steps_images/step1.JPG\")
\
Select two different integer numbers and then determine whether the
\multiplication is an integer number.
\Try some examples.
\![\"\"](\"/MathKey/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=9ac1b6af4faa05068c1e5f8c2313ad8f.png\")
![\"\"](\"/MathKey/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=bb1ab71e251074e26b1b38ed870bb26e.png\")
\ \
![\"\"](\"/MathKey/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=fb867d4b87c091e2611184aa2eed59dc.png\")
Since the product of each pair of integer numbers are integer numbers, the set of whole numbers is closed under multiplication.![\"\"](\"/userfiles/image/steps_images/solution.JPG\")
The set of integer numbers is closed under multiplication.
\