>perl -wMstrict -le
"my @nra = (
 8.8458e-119,
 1.06542e-52,
 2.68e-36,
 2.91405e-35,
 0.0190644,
 0.0205511,
 0.004,
 );
 for my $n (@nra) {
   my $fmt = $n > 0.001 ? '%5.2g' : '%5.3g';
   printf qq{$fmt \n}, $n;
   }
"
8.85e-119
1.07e-052
2.68e-036
2.91e-035
0.019
0.021
0.004

##</code><code>##

printf qq{%5.*g \n}, $_ > 0.001 ? 2 : 3, $_ for @nra;