No.
7, itself, is a multiple of 7 [7 * 1 = 7] and it is not a composite.
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Starting with 7, every other multiple is odd.
There are 16 such numbers.
3 and 7?
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.
There are 7 composite numbers from 10 to 20 (including the boundaries):10, 12, 14, 15, 16, 18 and 20