Prime Factorization of 15

"Prime Factorization" Calculator
Prime Factors of

What is the prime factorization of 15?

Answer

Prime Factors of 15:
3, 5

15 = 3 × 5 · composite · 4 factors

Division ladder

153
55
1

Left: what is left; right: the smallest prime that divides it; 1 at the bottom.

Second way — factor tree
1535

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Prime Factorization Table

NumberPrime Factors
22
33
422
55
62, 3
77
823
932
102, 5
1111
1222 × 3
1313
142, 7
153, 5
1624
1717
182 × 32
1919
2022 × 5
213, 7
222, 11
2323
2423 × 3
2552
262, 13
2733
2822 × 7
2929
302, 3, 5
3131

FAQ

What is the prime factorization of 15?

Prime Factors of 15: 3, 5

How many prime factors does 15 have?

Number 15 has 2 prime factors, all different.

How can you check the prime factorization of 15?

Multiply the factors back together: 3 × 5 = 15. Every factor is prime, so nothing splits any further and this decomposition is the only one that exists.

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