It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 671 641 is not a prime number.
For example, 671 641 can be divided by 337: 671 641 / 337 = 1 993.
For 671 641 to be a prime number, it would have been required that 671 641 has only two divisors, i.e., itself and 1.
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671 641 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 671 641 is about 819.537.
Thus, the square root of 671 641 is not an integer, and therefore 671 641 is not a square number.
The square of a number (here 671 641) is the result of the product of this number (671 641) by itself (i.e., 671 641 × 671 641); the square of 671 641 is sometimes called "raising 671 641 to the power 2", or "671 641 squared".
The square of 671 641 is 451 101 632 881 because 671 641 × 671 641 = 671 6412 = 451 101 632 881.
As a consequence, 671 641 is the square root of 451 101 632 881.
The multiples of 671 641 are all integers evenly divisible by 671 641, that is all numbers such that the remainder of the division by 671 641 is zero. There are infinitely many multiples of 671 641. The smallest multiples of 671 641 are: