14,21,28,35,42,49,56,63,70,77,84,91,98
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No two digit prime number exists that is a multiple of 7. All two digit numbers that are multiples of 7 are compositenumbers.
The correct phrasing is "seven and five are thirteen." In this case, "seven and five" are two separate numbers that are being added together to equal thirteen. When combining two distinct quantities, the verb should agree with the plural subject "seven and five," making "are" the appropriate verb choice.
Assuming you mean digits and not didgets, the answer is 6.
22, 33, 44, 55, 66, 77, 88, 99
no it is a prime number (prime means its multiples are only 1 and itself composite numbers can have multiples of many other things)