249
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249 + 249 = 498
249 is a composite number. A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite.
31
30% of 249= 30% * 249= 0.3 * 249= 74.7
Is this a trick-question? 1+0+0+8=9