Explanation:
5 * 7 * 11 * 13 + 55
= 5 * 7 * 11 * 13 + (5 * 11)
= 5 * 11 * (7 * 13 + 1)
Since there are other factors besides 1 and itself (5, 11, etc.), it is a composite number. (Shown)
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