Each entry in a hash is a scalar, so it contains just one value. However, this value can be a reference to an array. You should see perlref for details.

You can put an array reference into your hash using

$hash{key} = \@my_array;  # the \ makes it a reference

or

$hash{ket} = [1, 23, 37];
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You can put individual entries in your hash using:

$hash{key}->[0] = 1;
$hash{key}->[1] = 23;
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To get them out again use $hash{key}->[0] etc, or get the whole array using @array = @{$hash{key}}.