🔢 Math & Numbers Trivia
Quiz Set 4 — Number Theory
Answer all 10 questions. Click an option to see if you got it right!
Question 1 of 10
What is the smallest prime number?
2 is the smallest and only even prime number.
Question 2 of 10
Is zero even or odd?
Zero is an even number (divisible by 2 with no remainder).
Question 3 of 10
What are the first 4 Fibonacci numbers?
The Fibonacci sequence starts: 0, 1, 1, 2, 3, 5, 8...
Question 4 of 10
How many prime numbers are there?
Euclid proved there are infinitely many primes around 300 BC.
Question 5 of 10
What is the only even prime number?
2 is the only even prime number.
Question 6 of 10
What is 0! (zero factorial)?
By mathematical convention, 0! = 1.
Question 7 of 10
What are numbers divisible by only 1 and themselves?
Prime numbers have exactly two factors: 1 and the number itself.
Question 8 of 10
What is the sum of the first 10 natural numbers?
1+2+3+...+10 = 55 (using n(n+1)/2).
Question 9 of 10
What is a perfect number?
6 is perfect: 1+2+3=6. 28 is perfect: 1+2+4+7+14=28.
Question 10 of 10
What are twin primes?
Twin primes differ by 2, like (3,5), (11,13), (17,19).