It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 402 423 is not a prime number.
For example, 402 423 can be divided by 3: 402 423 / 3 = 134 141.
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For 402 423 to be a prime number, it would have been required that 402 423 has only two divisors, i.e., itself and 1.
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402 423 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 402 423 is about 634.368.
Thus, the square root of 402 423 is not an integer, and therefore 402 423 is not a square number.
The square of a number (here 402 423) is the result of the product of this number (402 423) by itself (i.e., 402 423 × 402 423); the square of 402 423 is sometimes called "raising 402 423 to the power 2", or "402 423 squared".
The square of 402 423 is 161 944 270 929 because 402 423 × 402 423 = 402 4232 = 161 944 270 929.
As a consequence, 402 423 is the square root of 161 944 270 929.
The multiples of 402 423 are all integers evenly divisible by 402 423, that is all numbers such that the remainder of the division by 402 423 is zero. There are infinitely many multiples of 402 423. The smallest multiples of 402 423 are: