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# Is 243 a Prime Number | Is 243 a Prime or Composite Number?

Is 243 a prime number? A prime number is divisible only by 1 and itself, which means that it has no divisor except 1 and the number itself. conversely, composite numbers have more than two factors. To determine if 243 is a prime or composite number, we need to divide it with numbers from 1 to 243. To know the answer to this question “is 243 is a prime number” and to get a detailed understanding of “how and why is 243 a prime number or a composite number?” let’s learn more.

• Is 243 a prime number? – no
• Is 243 a composite number? – yes
• prime factors of 243 – 3
• Is 243 a perfect square? – no
• factors of 243 – 1, 3, 9, 27, 81, 243 Reading: Is 243 a prime number

## Is 243 a prime number?

no, 243 is not a prime number. The number 243 is divisible by 1, 3, 9, 27, 81, 243. For a number to be classified as a prime number, it must have exactly two factors. Since 243 has more than two factors, that is, 1, 3, 9, 27, 81, 243, it is not a prime number. ## why isn’t 243 a prime number?

To understand whether 243 is composite or prime, it is important to find its factors.

factors of 243: 1, 3, 9, 27, 81, 243

since 243 has more than 2 factors, we can say that 243 is not a prime number.

☛ prime number calculator

## Is 243 a composite number?

yes, since 243 has more than two factors, i.e. 1, 3, 9, 27, 81, 243. In other words, 243 is a composite number because 243 has more than 2 factors.

problem statements:

fun facts:

• a pair of prime numbers x and y are said to be twin primes if the absolute difference between them is 2. example: (311, 313) are twin primes.
• numbers are said that x and y are coprime if they have only one common factor of 1.
• a palindromic prime is a prime number that, when read in reverse order, yields the same number. examples – 10601, 11311, 12421

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