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515 is a composite number.

NB

Remember

#1 ; Any number ending in an even number ( 0,2,4,6,8) is composite.

#2 ; Any number ending in '0' or '5' is composite.

#3 ; Any number whose digits sum to '9' is composite. e.g. 135 = 1 + 3 + 5 = 9 is a multiple of '9'.

#4 ; You only need to divide by '3' or '7' to test for Prime number. It the result is a whole number then it is NOT a prime.

NNB Since the above number , 515, ands in ;5; then it is composite.

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lenpollock

Lvl 17
∙ 2w ago

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