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Online judgment of prime numbers

App description

Prime numbers are also called prime numbers, and there are infinite numbers. A natural number greater than 1, except for 1 and itself, cannot be divisible by other natural numbers (prime numbers). In other words, the number has no other factors besides 1 and itself; otherwise it is called a composite number.

According to the basic theorem of arithmetic, each integer larger than 1 is either a prime number itself or can be written as a product of a series of prime numbers; and if the order of these prime numbers in the product is not considered, the written form is unique. The smallest prime number is 2.

Usage example:

Please enter the number: 55

Click "calculate" to output the result

It is not a prime number because it can be divisible by another number by 5


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