Break a number down into its prime factors — free and instant.
Every whole number greater than 1 breaks down into a unique product of prime numbers — this is the Fundamental Theorem of Arithmetic. This tool finds that breakdown by repeatedly dividing by the smallest prime that divides evenly, continuing until only 1 remains.
The result is shown both as a list of prime factors and in exponent notation (e.g. 360 = 2³ × 3² × 5), which is the standard way factorizations are written once a prime repeats.
Then its only prime factor is itself — the tool shows this directly rather than an empty or confusing result.
This uses trial division, which stays fast for numbers up to several million but slows down for very large numbers with large prime factors — it’s built for typical classroom-sized numbers, not cryptographic-scale factoring.
No — that tool answers "is this number prime?" This one breaks a composite number down into which primes multiply together to make it.