It is: 2*71 = 142
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1. 13 is a prime number, so it has only 1 and 13 as its factors, and 142 can't be divided by 13, so the GCF here is 1.
142/1 is the easiest.
142 = 21 x 711
142/2 = 71/71 = 1 2 x 71 = 142
No, it is clearly a multiple of 2, making it not a prime number.