Which is a prime number? 27, 25, 23, 21
- 27
- 25
- 23
- 21
Explanation
27 → divisible by 3 and 9 (not prime).
25 → divisible by 5 (not prime).
23 → divisible only by 1 and itself (prime).
21 → divisible by 3 and 7 (not prime).
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