Write a function that will multiply every prime number in the array or matrix by two, leaving all other numbers the same, and return that de-primed array or matrix. One will be treated as prime in this problem.
One in not prime!!!
And therefore should not become de-primed.
Check if sorted
Replace May with April
How long is the longest prime diagonal?
Scrabble Scores - 5
Lights Out 30 - 3x4x5, x moves
Lights Out 9 - 5x5, light-only solution? II
5 Prime Numbers
Divisible by 2
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