Is 143 a Prime Number? Yes or No, Factorization, and Explanation
143 is not a prime number. It is composite because it can be factored as 11 × 13.
Is 143 Prime? The Clear Answer
No, 143 is not a prime number. A prime number has exactly two divisors: 1 and itself. 143 has more than two divisors.
Factorization of 143
- 143 = 11 × 13
- Divisors of 143: 1, 11, 13, 143
Since 143 can be divided evenly by numbers other than 1 and 143 (specifically 11 and 13), it is composite.
Why 143 Is Not Prime: Plain-English Explanation
Prime numbers can only be divided by 1 and themselves with no remainder. 143 seems like it could be prime, but 11 × 13 equals 143, so it has additional factors. This means it fails the definition of a prime number.
Sharpen Your Prime-Spotting Skills
Quickly recognizing whether numbers like 143 are prime or composite is a valuable mental math skill. You can practice and improve this skill by playing Prime 59, a game that challenges you to identify prime numbers against the clock.
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Try Prime 59FAQ
Is 143 a prime number?
No, 143 is not a prime number. It is composite because it has divisors other than 1 and itself.
What is the factorization of 143?
143 can be factored as 11 × 13.
Why isn’t 143 a prime number?
143 isn’t prime because it has four divisors: 1, 11, 13, and 143. Primes have only two divisors.
How can I get better at spotting prime numbers like 143?
You can practice identifying primes quickly by playing Prime 59, a mental-math game focused on prime numbers.
What are the divisors of 143?
The divisors of 143 are 1, 11, 13, and 143.