It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 491 671 is not a prime number.
For example, 491 671 can be divided by 23: 491 671 / 23 = 21 377.
For 491 671 to be a prime number, it would have been required that 491 671 has only two divisors, i.e., itself and 1.
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491 671 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 491 671 is about 701.193.
Thus, the square root of 491 671 is not an integer, and therefore 491 671 is not a square number.
The square of a number (here 491 671) is the result of the product of this number (491 671) by itself (i.e., 491 671 × 491 671); the square of 491 671 is sometimes called "raising 491 671 to the power 2", or "491 671 squared".
The square of 491 671 is 241 740 372 241 because 491 671 × 491 671 = 491 6712 = 241 740 372 241.
As a consequence, 491 671 is the square root of 241 740 372 241.
The multiples of 491 671 are all integers evenly divisible by 491 671, that is all numbers such that the remainder of the division by 491 671 is zero. There are infinitely many multiples of 491 671. The smallest multiples of 491 671 are: