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4, 9, 16, 25, and 36 are the square numbers between 1 and 40.
There are infinitely many numbers between 20 and 40. For example: 21.0000000000135120000001 21.0000000000135120000002 21.000000000013512000000301 21.000000000013512000000302 21.000000000013512000000303 and so on.
20
There are no square numbers between 40 & 48. 62 = 36 72 = 49
Multiples of 5 are not prime numbers except 5, so there are none. But, there are prime numbers between 20 and 40, like 23, 29, 31 and 37.