It is a Prime number.
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No, 13 is not a composite number.
(2X3X5X13X17) + 13 = 6643 This is a composite number.
377 is a composite number because it is divisible by 29 and 13.
91 is a composite number. This is because composite numbers are any number that has another factor besides one and itself. Therefore, since 7 and 13 are factors of 91 that makes it a composite number.
71113 + 13 = 71126 which is a composite number. 7654321 + 5 = 7654326 which is a composite number.