61, 37
89, 7, 2
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100
They can be 31+67 = 98
the "sum" means to add the numbers, therefore:98 + 126 = 224
The only two digit numbers whose digits add up to 17 are 89 and 98. Since 98 is an even number, 89 is prime.
Factors of prime numbers are only 1 and itself. Nothing else.The factors of 98 are 1, 2, 7, 14, 49, and 98. So, it is not prime.