7*7 = 49 is the square number.
Also, 7*7*7*7, and 7*7*7*7*7*7 etc.
Any number in the 7 times table, other than 7 itself, cannot be a prime since, by definition, it is divisible by 7. 7 itself, however, is a prime.
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5
There is only one even prime number, the number 2.
Yes. Every prime number appears in its own times table. But it does not appear in any other.
6 with any even exponent, like 36 or 1296.
None, since it is a prime number (unless you consider the 41 times table or the 1 times table).