No. It has the factors 3 and 83.
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249 = 3*83
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.
249 is a composite number because it has factors 3x83.
1, 3, 9, 83, 249, 7473 and 83 are prime.
249 + 249 = 498