4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 22, 24, 25, 26, 27, 28, 30, 32
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Rectangular numbers are a subset of composite numbers. The squares of prime numbers will be composite but not rectangular.
1,4,6,8,9,10,12,14,15,16,18,20,21,22,24,25,26,27,28,30,32,33,34,35,36,38,39 are the composite numbers between 1 and 40.
It is composite.
The difference between 309 and 132 is 177 numbers.
132 is a composite number but 5 is not one of its factors