It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 491 774 977 is not a prime number.
For example, 491 774 977 can be divided by 461: 491 774 977 / 461 = 1 066 757.
For 491 774 977 to be a prime number, it would have been required that 491 774 977 has only two divisors, i.e., itself and 1.
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491 774 977 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 491 774 977 is about 22 176.000.
Thus, the square root of 491 774 977 is not an integer, and therefore 491 774 977 is not a square number.
The square of a number (here 491 774 977) is the result of the product of this number (491 774 977) by itself (i.e., 491 774 977 × 491 774 977); the square of 491 774 977 is sometimes called "raising 491 774 977 to the power 2", or "491 774 977 squared".
The square of 491 774 977 is 241 842 628 003 350 528 because 491 774 977 × 491 774 977 = 491 774 9772 = 241 842 628 003 350 528.
As a consequence, 491 774 977 is the square root of 241 842 628 003 350 528.
491 774 977 is a number with 9 digits.
The multiples of 491 774 977 are all integers evenly divisible by 491 774 977, that is all numbers such that the remainder of the division by 491 774 977 is zero. There are infinitely many multiples of 491 774 977. The smallest multiples of 491 774 977 are: