It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 997 421 399 is not a prime number.
For example, 997 421 399 can be divided by 13: 997 421 399 / 13 = 76 724 723.
For 997 421 399 to be a prime number, it would have been required that 997 421 399 has only two divisors, i.e., itself and 1.
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997 421 399 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 997 421 399 is about 31 581.979.
Thus, the square root of 997 421 399 is not an integer, and therefore 997 421 399 is not a square number.
The square of a number (here 997 421 399) is the result of the product of this number (997 421 399) by itself (i.e., 997 421 399 × 997 421 399); the square of 997 421 399 is sometimes called "raising 997 421 399 to the power 2", or "997 421 399 squared".
The square of 997 421 399 is 994 849 447 183 117 184 because 997 421 399 × 997 421 399 = 997 421 3992 = 994 849 447 183 117 184.
As a consequence, 997 421 399 is the square root of 994 849 447 183 117 184.
997 421 399 is a number with 9 digits.
The multiples of 997 421 399 are all integers evenly divisible by 997 421 399, that is all numbers such that the remainder of the division by 997 421 399 is zero. There are infinitely many multiples of 997 421 399. The smallest multiples of 997 421 399 are: