Prime. It is only divisible by itself and one.
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7 is a prime number and therefore its only prime factor is itself.7 is already prime. Its only prime factor is itself.
Because 7 is a factor of 28 and 63 and 7 is a prime number.
The only prime factor of 49 is seven (7).
The prime factors are: 2, 7
7 is a prime factor of 49. Actually, it is the square root.