It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 491 438 is not a prime number.
For example, 491 438 can be divided by 2: 491 438 / 2 = 245 719.
For 491 438 to be a prime number, it would have been required that 491 438 has only two divisors, i.e., itself and 1.
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491 438 is an even number, because it is evenly divisible by 2: 491 438 / 2 = 245 719.
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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 491 438 is about 701.026.
Thus, the square root of 491 438 is not an integer, and therefore 491 438 is not a square number.
The square of a number (here 491 438) is the result of the product of this number (491 438) by itself (i.e., 491 438 × 491 438); the square of 491 438 is sometimes called "raising 491 438 to the power 2", or "491 438 squared".
The square of 491 438 is 241 511 307 844 because 491 438 × 491 438 = 491 4382 = 241 511 307 844.
As a consequence, 491 438 is the square root of 241 511 307 844.
The multiples of 491 438 are all integers evenly divisible by 491 438, that is all numbers such that the remainder of the division by 491 438 is zero. There are infinitely many multiples of 491 438. The smallest multiples of 491 438 are: