Yes it is.
13 x 19 = 247
They are: 13 and 19
The common factors are: 1, 13, 19, 247
The only whole number that can go into 13 and 19 evenly (their common factor) is ' 1 '.
The factors of 247 are 13 and 19, as 13 multiplied by 19 equals 247. Therefore, 13 times 19 is 247.
247 13,19
247/13=19 247 is not a prime
1, 71, 1631, 13, 19, 29, 247, 377, 551, 7163
Multiples of 247
13*1913 times 19 = 247
Both values are prime, thus we conclude that the GCF (and the only common factor) is 1.
247 13,19