It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 16 423 is not a prime number.
For example, 16 423 can be divided by 11: 16 423 / 11 = 1 493.
For 16 423 to be a prime number, it would have been required that 16 423 has only two divisors, i.e., itself and 1.
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16 423 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 16 423 is about 128.152.
Thus, the square root of 16 423 is not an integer, and therefore 16 423 is not a square number.
The square of a number (here 16 423) is the result of the product of this number (16 423) by itself (i.e., 16 423 × 16 423); the square of 16 423 is sometimes called "raising 16 423 to the power 2", or "16 423 squared".
The square of 16 423 is 269 714 929 because 16 423 × 16 423 = 16 4232 = 269 714 929.
As a consequence, 16 423 is the square root of 269 714 929.
The multiples of 16 423 are all integers evenly divisible by 16 423, that is all numbers such that the remainder of the division by 16 423 is zero. There are infinitely many multiples of 16 423. The smallest multiples of 16 423 are: