It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 988 620 421 is not a prime number.
For example, 988 620 421 can be divided by 101: 988 620 421 / 101 = 9 788 321.
For 988 620 421 to be a prime number, it would have been required that 988 620 421 has only two divisors, i.e., itself and 1.
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988 620 421 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 988 620 421 is about 31 442.335.
Thus, the square root of 988 620 421 is not an integer, and therefore 988 620 421 is not a square number.
The square of a number (here 988 620 421) is the result of the product of this number (988 620 421) by itself (i.e., 988 620 421 × 988 620 421); the square of 988 620 421 is sometimes called "raising 988 620 421 to the power 2", or "988 620 421 squared".
The square of 988 620 421 is 977 370 336 818 217 216 because 988 620 421 × 988 620 421 = 988 620 4212 = 977 370 336 818 217 216.
As a consequence, 988 620 421 is the square root of 977 370 336 818 217 216.
988 620 421 is a number with 9 digits.
The multiples of 988 620 421 are all integers evenly divisible by 988 620 421, that is all numbers such that the remainder of the division by 988 620 421 is zero. There are infinitely many multiples of 988 620 421. The smallest multiples of 988 620 421 are: