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Penelope Larson
Mathematics
16 October, 04:25
Which number is a prime number? 21,22,23,24
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Amira Tran
16 October, 04:26
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23 is the prime number bc it isn't divisable by anything
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Fowler
16 October, 04:36
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A prime number is a number that has no factors, except for itself and one.
21 is not a prime number, because in addition to having one and itself as factors, it has 7 and 3. (1 x 21 = 21.) (7 x 3 = 21.)
22 is not a prime number. It's easy to tell because it is an even number. (1 x 22 = 22.) (2 x 11 = 22.)
24 is not a prime number. It's even, but also has more factors. (2 x 12 = 24.) (3 x 8 = 24.) (4 x 6 = 24.)
23, however, has no other factors but one and itself. (1 x 23 = 23.) So therefore, it is prime.
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