Prime factorization of 26 makes it much clear.
26 = 2x13. Both 13 and 2 go into 26.
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The GCF of 26 and 65 is 13. 13 is a prime number. "Relatively prime" refers to numbers whose GCF is 1.
'26' has only two factors, they are '2' & '13' ; 2 x 13 = 26 or 13 x 2 = 26 Both '2' and '13' are prime numbers.
5184,12592,21728,31296,4864,6648,8576,9432,12324,16288,18216,24192,27162,32144,36108,4896,5481,6472,72
1 and 2.
53 and 2 are both prime numbers and their LCM is 106