It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 690 671 is not a prime number.
For example, 690 671 can be divided by 349: 690 671 / 349 = 1 979.
For 690 671 to be a prime number, it would have been required that 690 671 has only two divisors, i.e., itself and 1.
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690 671 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 690 671 is about 831.066.
Thus, the square root of 690 671 is not an integer, and therefore 690 671 is not a square number.
The square of a number (here 690 671) is the result of the product of this number (690 671) by itself (i.e., 690 671 × 690 671); the square of 690 671 is sometimes called "raising 690 671 to the power 2", or "690 671 squared".
The square of 690 671 is 477 026 430 241 because 690 671 × 690 671 = 690 6712 = 477 026 430 241.
As a consequence, 690 671 is the square root of 477 026 430 241.
The multiples of 690 671 are all integers evenly divisible by 690 671, that is all numbers such that the remainder of the division by 690 671 is zero. There are infinitely many multiples of 690 671. The smallest multiples of 690 671 are: