They did. Though they didn't call Atomic bomb at that time.
Nuclear Wars in Ancient India – Literary Evidence
Ancient Indians (in tamil) also had a numeric system to denote large numbers as below, even before the terms Millions/Billions/Trillions/Quadrallions were termed.
1 = ONDRU = One = 10 [SUP]0[/SUP]
10 = PATHU = Ten = 10 [SUP]1[/SUP]
100 = NOORU = Hundred = 10[SUP] 2[/SUP]
1,000 = AAYIRAM = One Thousand = 10[SUP] 3[/SUP]
10,000 = PATHAAYIRAM = Ten Thousand = 10 [SUP]4[/SUP]
1,00,000 = LATCHAM = Hundred Thousand = 10 [SUP]5[/SUP]
10,00,000 = PATHU LATCHAM = One Million = 10 [SUP]6[/SUP]
1,00,00,000 = KODI = Ten Million = 10 [SUP]7[/SUP]
10,00,00,000 = PATHU KODI = Hundred Million = 10 [SUP]8[/SUP]
1,00,00,00,000 = ARPUTHAM = One Billion = 10[SUP] 9[/SUP]
10,00,00,00,000 = PATHU ARPUTHAM = Ten Billion = 10 [SUP]10[/SUP]
1,00,00,00,00,000 = NIGARPUTHAM = Hundred Billion = 10 [SUP]11[/SUP]
10,00,00,00,00,000 = PATHU NIGARPUTHAM = One Trillion = 10 [SUP]12[/SUP]
1,00,00,00,00,00,000 = KUMBAM = Ten Trillion = 10 [SUP]13[/SUP]
10,00,00,00,00,00,000 = PATHU KUMBAM = Hundred Trillion = 10 [SUP]14[/SUP]
1,00,00,00,00,00,00,000 = GANAM = One Quadrillion = 10 [SUP]15[/SUP]
10,00,00,00,00,00,00,000 = PATHU GANAM = Ten Quadrillion = 10 [SUP]16[/SUP]
1,00,00,00,00,00,00,00,000 = KARPAM = Hundred Quadrillion = 10 [SUP]17[/SUP]
10,00,00,00,00,00,00,00,000 = PATHU KARPAM = One Quintillion = 10 [SUP]18[/SUP]
1,00,00,00,00,00,00,00,00,000 = NIKARPAM = Ten Quintillion = 10 [SUP]19[/SUP]
10,00,00,00,00,00,00,00,00,000 = PATHU NIKARPAM = Hundred Quintillion = 10 [SUP]20[/SUP]
1,00,00,00,00,00,00,00,00,00,000 = PATHUMAM = One Sextillion = 10 [SUP]21[/SUP]
10,00,00,00,00,00,00,00,00,00,000 = PATHU PATHUMAM = Ten Sextillion = 10 [SUP]22[/SUP]
1,00,00,00,00,00,00,00,00,00,00,000 = SANGGAM = Hundred Sextillion = 10 [SUP]23[/SUP]
10,00,00,00,00,00,00,00,00,00,00,000 = PATHU SANGGAM = One Septillion = 10[SUP] 24[/SUP]
1,00,00,00,00,00,00,00,00,00,00,00,000 = VELLAM = Ten Septillion = 10 [SUP]25[/SUP]
10,00,00,00,00,00,00,00,00,00,00,00,000 = PATHU VELLAM = Hundred Septillion = 10[SUP] 26[/SUP]
1,00,00,00,00,00,00,00,00,00,00,00,00,000 = ANNIYAM = One Octillion = 10 [SUP]27[/SUP]
10,00,00,00,00,00,00,00,00,00,00,00,00,000 = PATHU ANNIYAM = Ten Octillion = 10 [SUP]28[/SUP]
1,00,00,00,00,00,00,00,00,00,00,00,00,00,000 = ARTTAM = Hundred Octillion = 10 [SUP]29[/SUP]
10,00,00,00,00,00,00,00,00,00,00,00,00,00,000 = PATHU ARTTAM = One Nonillion = 10 [SUP]30[/SUP]
1,00,00,00,00,00,00,00,00,00,00,00,00,00,00,000 = PARARTTAM = Ten Nonillion = 10 [SUP]31[/SUP]
10,00,00,00,00,00,00,00,00,00,00,00,00,00,00,000 = PATHU PARARTTAM = Hundred Nonillion = 10[SUP] 32[/SUP]
1,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,000 = POORIYAM = One Decillion = 10 [SUP]33[/SUP]
10,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,000 = PATHU POORIYAM = Ten Decillion = 10 [SUP]34[/SUP]
1,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,000 = MUKKODI = Hundred Decillion = 10 [SUP]35[/SUP]
10,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,000 = PATHU MUKKODI = One Undecillion = 10 [SUP]36[/SUP]
1,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,000 = MAHAYUGAM = Ten Undecillion = 10[SUP] 37
[/SUP]I accept that India has its own set of drawbacks, but that doesn't mean that we should despice India.