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Notice whether the number is odd or even. If it's even, the first prime factor is 2.
Pretty good. The best is the highest prime number on the board.
11 is a prime number.
5 is a prime number. It is only evenly divisible by itself and one.5 is a prime number, so the only prime factor of 5 is itself.5 is already a prime number; it has no factorization.
No. It is an even number. The only even number that is prime is the number 2.