It is may be prime only if one term is 2. for example: 3+2=5
But one term may be 2 and the result composite: 7+2=9=3*3
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A prime plus another prime is at the very least going to be an even number since all primes (with the exception of 2) are odd.
No. (5x3x17) + 17 =255 + 17 =272 (This is not prime.)
yes
It is: 3 plus 97 = 100
It would always be a natural number.