It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 671 521 is not a prime number.
For example, 671 521 can be divided by 659: 671 521 / 659 = 1 019.
For 671 521 to be a prime number, it would have been required that 671 521 has only two divisors, i.e., itself and 1.
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671 521 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 671 521 is about 819.464.
Thus, the square root of 671 521 is not an integer, and therefore 671 521 is not a square number.
The square of a number (here 671 521) is the result of the product of this number (671 521) by itself (i.e., 671 521 × 671 521); the square of 671 521 is sometimes called "raising 671 521 to the power 2", or "671 521 squared".
The square of 671 521 is 450 940 453 441 because 671 521 × 671 521 = 671 5212 = 450 940 453 441.
As a consequence, 671 521 is the square root of 450 940 453 441.
The multiples of 671 521 are all integers evenly divisible by 671 521, that is all numbers such that the remainder of the division by 671 521 is zero. There are infinitely many multiples of 671 521. The smallest multiples of 671 521 are: