If the number is odd, you can immediately eliminate 2.
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The two prime numbers immediately following 17 are 19 and 23.
47 x 53 = 2491
47 x 43 = 2021
It is: 47*53 = 2491
The number 356 is not prime. You should immediately notice that it is an even number, divisible by two, therefore it cannot be prime. Only odd numbers can be prime.