97 is the only number that has only two factors, 1 and itself. It is a Prime number.
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49 is not a prime number. It is the square of the prime number 7.
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.
49 is a prime number itself.
Factor each number into its prime factors. 14 = 2 * 7 49 = 7 * 7 We take all the prime factors they have in common, and multiply. In this case the only prime factor they have in common is 7, so that is the answer.
The prime factor of 49 is 7. 49 is the square of 7.