It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 423 721 is not a prime number.
For example, 423 721 can be divided by 181: 423 721 / 181 = 2 341.
For 423 721 to be a prime number, it would have been required that 423 721 has only two divisors, i.e., itself and 1.
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423 721 is an odd number, because it is not evenly divisible by 2.
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A number is a perfect square (or a square number) if its square root is an integer; that is to say, it is the product of an integer with itself. Here, the square root of 423 721 is about 650.939.
Thus, the square root of 423 721 is not an integer, and therefore 423 721 is not a square number.
The square of a number (here 423 721) is the result of the product of this number (423 721) by itself (i.e., 423 721 × 423 721); the square of 423 721 is sometimes called "raising 423 721 to the power 2", or "423 721 squared".
The square of 423 721 is 179 539 485 841 because 423 721 × 423 721 = 423 7212 = 179 539 485 841.
As a consequence, 423 721 is the square root of 179 539 485 841.
The multiples of 423 721 are all integers evenly divisible by 423 721, that is all numbers such that the remainder of the division by 423 721 is zero. There are infinitely many multiples of 423 721. The smallest multiples of 423 721 are: