Yes. Every Prime number appears in its own times table. But it does not appear in any other.
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Any number, including prime numbers, can be multiplied by 1.
The six times tables are any and all multiples of 6. Therefore, any numbers that divide evenly by 6 will be in the six times tables, and any that don't won't be. 90/6 = 15, and so 90 does divide evenly by 6. Thus, 90 is in the six times tables.
Once you multiply a prime by any number other than 1, it becomes composite.
There are no two numbers that can be multiplied to get 19; 19 is not divisible by any number.
Prime numbers are divisible because any numbers that are divisible are prime. If a number isn't divisible, it isn't prime. Prime numbers have to be divisible by at least one pair of numbers to be prime.