It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 423 138 is not a prime number.
For example, 423 138 can be divided by 2: 423 138 / 2 = 211 569.
For 423 138 to be a prime number, it would have been required that 423 138 has only two divisors, i.e., itself and 1.
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423 138 is an even number, because it is evenly divisible by 2: 423 138 / 2 = 211 569.
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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 423 138 is about 650.491.
Thus, the square root of 423 138 is not an integer, and therefore 423 138 is not a square number.
The square of a number (here 423 138) is the result of the product of this number (423 138) by itself (i.e., 423 138 × 423 138); the square of 423 138 is sometimes called "raising 423 138 to the power 2", or "423 138 squared".
The square of 423 138 is 179 045 767 044 because 423 138 × 423 138 = 423 1382 = 179 045 767 044.
As a consequence, 423 138 is the square root of 179 045 767 044.
The multiples of 423 138 are all integers evenly divisible by 423 138, that is all numbers such that the remainder of the division by 423 138 is zero. There are infinitely many multiples of 423 138. The smallest multiples of 423 138 are: