25 and 27 are composite numbers because they both have factors in addition to 1 and themselves.
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25 = 5 x 5 27 = 3 x 9 29 is prime
23 and 29 are prime numbers
29 is the next prime number after 27. But 27 is not a prime! 3 x 9 = 27!
To know what numbers are prime between 25-50, you'd have to figure out if any number besides 1 and that number itself can go into that number. Another key, is that all even numbers between 25 and 50 are NOT prime numbers. The only even number, that is prime is 2. So you'd have to go through all the odds between 25-50. For example: 27 is divisible by: 1,3,9, and 27 ~composite~ 29 is divisible by 1 and 29 ~prime~ Hope that helps!
It can be. 27 is relatively prime to 28.