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The prime number that is greater than 20 but less than 29 is 23.
29 - the next available prime number.
2 digit number which is square number less than 42 but greater than 29 = 36square numbers are 2, 9, 16, 25, 36, 49,...
23 and 29
25 is a composite number like every number greater than 5 that ends with a 5. 29 is a prime number because it has no factors other than 1 and itself.