Even numbers end in 0,2,4,6,or 8. 712 ends in 2 so it's even.
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As 712 is ending by an even digit then it can be divided by 2 thus 712 is not prime
Yes it would Even + even = even Even + odd = odd Odd + odd = even
because that's the theory of maths even x even = even even x odd = odd even + even = even even + odd = odd
because... odd+odd=even even+odd=odd e.g 1+1+1=3 odd+odd+odd=odd
odd. odd=odd odd+odd=even odd+odd+odd=odd it keeps alternating in that fashion