2509 is a composite number, NOT a Prime number; factors of 2509 are 1, 13, 193, and 2509.
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Since the numbers 2509 and 2520 share no common positive integer factors, the proper fraction 2509/2520 is already expressed in its simplest form.
2509.6667
7 is a prime number!
109 is a prime number.
167 is a prime number.