(128,1)(64,2)(32,4)(16,8)
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Factors of 128 in pairs: 1 x 128, 2 x 64, 4 x 32, 8 x 16.
The difference is between factor pairs and distinct factors. With square numbers, one of the factor pairs will be the same number twice. When listing the distinct factors, that number is only listed once.
The only prime factor of 128 is 2 because 2 x 2 x 2 x 2 x 2 x 2 x 2 = 128
1,24
Yes, 2 is a factor of 64. The reason behind this is that 64 is divisible by 2. Numbers which go into 64 are its factors and 2 is one of the factors.