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Q: Are there any prime numbers that are in an times tables?

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Any number, including prime numbers, can be multiplied by 1.

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.

Any number that is not a prime number.. . .Prime numbers: 1,3,5 and 7

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.

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Think of the definition of a prime number: It has no divisors other than itself and 1 so it cannot be a multiple of any other numbers.

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.

Any two prime numbers will be relatively prime. Numbers are relatively prime if they do not have any prime factors in common. Prime numbers have only themselves as prime factors, so all prime numbers are relatively prime to the others.

A way to do this is to spot any obvious prime factors. In this case, 275 ends in a 5 and so is divisible by 5. Doing that gives 275/5 = 55. This is now clearly the product of 5 and 11, from times tables. Thus 275 as a product of prime numbers is 5x5x11

There are no two numbers that can be multiplied to get 19; 19 is not divisible by any number.

Any two prime numbers.

Co-prime numbers, relatively prime numbers and any set of prime numbers.

There are a lot of possibilities. The seventh square number is 49. 5 times 5 times any other prime number will be greater than 49. 5 times any pair of prime numbers seven or greater will also satisfy the conditions.

Any number that is not a prime number.. . .Prime numbers: 1,3,5 and 7

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.

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