It's a Prime number because if you divide it by any number (other than itself or the number 1), you will not get a whole number as an answer.
Try it!
41/2 = 20.5,
41/3 = 13.6667
41/4 = 10.25
...
41/20 = 2.05
None of the answers are whole numbers (ie. they have numbers after the decimal point), so 41 is a prime number.
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