Exercise · ZW-PRIME-NUMBER-006 · ★★☆ Intermediate
Which of these statements about primes is true?
Choose one option.
Show answer
- B. 2 is the only even prime
Explanation
Every even number greater than 2 is divisible by 2, so it is not prime. 1 is not prime, 9 = 3·3 is an odd composite and 6 = 2·3 is a product of primes.
Review the concept: Prime number
A prime number \(p\) is an integer greater than 1 whose only positive divisors are 1 and itself.
\[p>1,\quad d>0,\ d\mid p\ \Rightarrow\ d\in\{1,p\}\]
More practice problems: prime number
- ZW-PRIME-NUMBER-001 Which of these numbers is prime?
- ZW-PRIME-NUMBER-002 How many prime numbers are less than 30?
- ZW-PRIME-NUMBER-003 What is the smallest prime factor of 221?
- ZW-PRIME-NUMBER-004 What is the prime factorization of 360?
- ZW-PRIME-NUMBER-005 To decide whether 97 is prime by trial division, what is the largest prime you must test?
- ZW-PRIME-NUMBER-007 How many positive divisors does 60 have?
- ZW-PRIME-NUMBER-008 What is the smallest prime greater than 100?
- ZW-PRIME-NUMBER-009 If a prime p divides the product ab, what follows?