It is almost certainly not reading the prompt back in. It may look like it is, as an artifact of end-of-line processing. Modify the print statement to look like this and see what you get:

print "\nYou entered \n|$number|\n";
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See what's between the two '|' symbols, I'll bet it doesn't include the prompt. Or try chomp $number; before the print.

--Bob Niederman, http://bob-n.com