It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 491 407 is not a prime number.
For example, 491 407 can be divided by 7: 491 407 / 7 = 70 201.
For 491 407 to be a prime number, it would have been required that 491 407 has only two divisors, i.e., itself and 1.
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491 407 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 491 407 is about 701.004.
Thus, the square root of 491 407 is not an integer, and therefore 491 407 is not a square number.
The square of a number (here 491 407) is the result of the product of this number (491 407) by itself (i.e., 491 407 × 491 407); the square of 491 407 is sometimes called "raising 491 407 to the power 2", or "491 407 squared".
The square of 491 407 is 241 480 839 649 because 491 407 × 491 407 = 491 4072 = 241 480 839 649.
As a consequence, 491 407 is the square root of 241 480 839 649.
The multiples of 491 407 are all integers evenly divisible by 491 407, that is all numbers such that the remainder of the division by 491 407 is zero. There are infinitely many multiples of 491 407. The smallest multiples of 491 407 are: