53 is a Prime number because it has exactly two factors, 1 and the number itself. 35, 27, and 49 are composite numbers because they have more than two factors.
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35 and 49, among others.
49 is a prime number itself.
There are 15 prime numbers between 1 and 49
The greatest common divisor of the numbers 35 and 49 is 7.
49 = 7 x 7 and 7 is prime