Which of the following is a prime number?
23882990
16769023
38377296
11723835
A prime number has no positive divisors other than 1 and itself. Hence, a prime bigger than 2 cannot be even. All prime numbers bigger than 5, written in the usual decimal system, end in 1, 3, 7, or 9.
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23882990
16769023
38377296
11723835
answers

13

159

22

18

21

261

133

32

89

16315

15

17

18

17

26

29

10

19