Prime Numbers 1-1000
REFPrime Number Grid
Prime
Composite
Prime Numbers List
Prime Number Facts
Total Primes 1-1000
168
First 10 Primes
2, 3, 5, 7, 11, 13, 17, 19, 23, 29
Largest Prime under 1000
997
Twin Primes
Pairs differing by 2: (3,5), (5,7), (11,13), (17,19), (29,31), (41,43), etc.
Understanding Prime Numbers
A prime number is divisible only by 1 and itself. 2 is the only even prime. The Sieve of Eratosthenes identifies primes by eliminating multiples: start with 2, mark all multiples as composite, then repeat with next unmarked number. Prime numbers are fundamental in mathematics, cryptography, and computer science. The grid above highlights all 168 primes between 1 and 1000.