It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 493 138 is not a prime number.
For example, 493 138 can be divided by 2: 493 138 / 2 = 246 569.
For 493 138 to be a prime number, it would have been required that 493 138 has only two divisors, i.e., itself and 1.
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493 138 is an even number, because it is evenly divisible by 2: 493 138 / 2 = 246 569.
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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 493 138 is about 702.238.
Thus, the square root of 493 138 is not an integer, and therefore 493 138 is not a square number.
The square of a number (here 493 138) is the result of the product of this number (493 138) by itself (i.e., 493 138 × 493 138); the square of 493 138 is sometimes called "raising 493 138 to the power 2", or "493 138 squared".
The square of 493 138 is 243 185 087 044 because 493 138 × 493 138 = 493 1382 = 243 185 087 044.
As a consequence, 493 138 is the square root of 243 185 087 044.
The multiples of 493 138 are all integers evenly divisible by 493 138, that is all numbers such that the remainder of the division by 493 138 is zero. There are infinitely many multiples of 493 138. The smallest multiples of 493 138 are: