Greetings all,
A few suggestions...
To access the variables that reside in your @number array you will need to refer to them as scalars so $number[0] would give you the first element of your array.
To get the size of your array use scalar @number
Now going through an array can be accomplished in a myriad of different ways but here are two of the more common ones aside from the while loop you already have.

#the foreach style sets a variable, in this case $num, to 
#each element of your array. If you did not specify a
#variable, then the special variable $_ would be set 
#each time through.

foreach my $num (@number){
   if($num =~ /9432$/){
      print "match found";
   }else{
      print "match failed";
   }
}

#a C-style for loop in which case you will be using
#the $i variable to count from 0 to the end of your array 
#based on how big it is which we now know is scalar @number.

for(my $i=0 ; $i < scalar @number ; $i++){
   if($number[$i] =~ /9432$/){
      print "match found";
   }else{
      print "match failed";
   }
}
[download]

One last thing if you are looking for number ending in some sequence of digits, in this case '9432' you do not need to use the ^ anchor, just the $ anchor, since the ^ indicates to the regexp engine that you are checking from the beginning of the string. The $ indicates the end of the string, so your pattern would be /9432$/ since you are trying to match the end.
I hope that helps.

-InjunJoel