No it isn't, it's divisible by 10 and 2 and 5.
Also,
No 780 is not a Prime number. A prime number is defined as a number whos divisbility is 1 and its self.
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It is a composite number.
The prime factors of 780 are: 2,3,5,13
As a product of its prime factors: 2*2*3*5*13 = 780
22 x 3 x 5 x 13 = 780
780 = 22 x 3 x 5 x 13