It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 690 216 is not a prime number.
For example, 690 216 can be divided by 2: 690 216 / 2 = 345 108.
For 690 216 to be a prime number, it would have been required that 690 216 has only two divisors, i.e., itself and 1.
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690 216 is an even number, because it is evenly divisible by 2: 690 216 / 2 = 345 108.
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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 690 216 is about 830.792.
Thus, the square root of 690 216 is not an integer, and therefore 690 216 is not a square number.
The square of a number (here 690 216) is the result of the product of this number (690 216) by itself (i.e., 690 216 × 690 216); the square of 690 216 is sometimes called "raising 690 216 to the power 2", or "690 216 squared".
The square of 690 216 is 476 398 126 656 because 690 216 × 690 216 = 690 2162 = 476 398 126 656.
As a consequence, 690 216 is the square root of 476 398 126 656.
The multiples of 690 216 are all integers evenly divisible by 690 216, that is all numbers such that the remainder of the division by 690 216 is zero. There are infinitely many multiples of 690 216. The smallest multiples of 690 216 are: