No Prime number only has one factor. Each prime number has itself and 1 as factors.
Now, the number 1 of course has only one factor, but it is technically not a prime number.
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103 is a prime number. The only two factors of a prime number are 1 and itself. The only factor pair of 103 is 1 x 103. There is only one factor pair of a prime number. The proper factors of 103 are only 1 or, if the definition you are using excludes 1, there are none. The only prime factor of 103 is 103. There is only one prime factor of a prime number - itself. The distinct prime factor (listing each prime factor only once) of 103 is also 103.
Each prime number only has two factors: one and itself. The only factor any set of prime numbers has in common is 1.
43 is a prime number and doesn't have a rainbow because it only has one prime factor: itself.
79 is a prime number. The only two factors of a prime number are 1 and itself.The only prime factor of 79 is 79. There is only one prime factor of a prime number - itself.The distinct prime factor (listing each prime factor only once) of 79 is also 79.The prime factorization of 79 is 79. In some cases, to emphasize that it is prime, you might write the prime factorization as 1 x 79.
Because prime numbers only have one factor pair.